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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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  1.  
    2. nice
    1 weeks ago by

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  2.  
    3. should we not also account for gravitational acceleration(g) in this question along with the acceleration due to the force generated by the electrical field
    1 months ago by

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  3.  
    4. Solutions to test?
    9 months ago by Kedar Pathak

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  4.  
    5. sir are we ignoring gravity because motion in horizontal plane or because negligible wrt electrostatic force
    9 months ago by

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  5.  
    6. Sir, but as you said in previous video, larger charges than test charges produce induction effect on source of electric field. So my question is are we ignoring the effect of induction over here then.
    9 months ago by

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  6.  
    7. sir answer of question 31 of quset-1 of the electric charge and field is wrong
    9 months ago by

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  7.  
    8. sir what will happen when we turn off the external electric field?
    10 months ago by

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  8.  
    9. nice
    10 months ago by

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  9.  
    10. how tension = Fradial / 2pi ???
    1 years ago by

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  10.  
    11. sir why is tan theta taken as 1/20 as they both dont make a right angle there the value of hypotmuse should be taken as 20 and opposite side(from angle theta) as 1 after that we should calculated the adjacent side of the triangle using pythagoras theoram which gives us the value of tan theta as 1/root(399)
    1 years ago by Shashwat

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  11.  
    12. Thanks for providing such an amazing content for us
    1 years ago by Devansh Mishra

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  12.  
    13. How is the limit set from -l/2 to l/2
    1 years ago by Shreya Raut

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  13.  
    14. sir in the x direction you have done cos 45 cos 45 but in x direction it was cos theta 2 - cos theta 1 and in y direction it was sin theta 1 sin theta 2. please resolve my doubt
    1 years ago by

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  14.  
    15. Sir please tell my doubt that why you are taking ACC. negative please
    1 years ago by

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  15.  
    16. Sir, I want to that when we will remove the external positive charge then the atoms which are converted into dipoles will then again convert into the normal atom?
    1 years ago by

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  16.  
    17. thank you sir
    1 years ago by

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  17.  
    18. sir your taking left as right ,right as left , but in this video concept is quite confusing
    2 years ago by Rohit Roy

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  18.  
    19. HOW TO ACCESS THIS VIDEO SOLUTION ? IT SHOWS THE VIDEO SOLUTION VIDEO OF ILLUSTRATION 43 OF ELECTROSTATS AS PRIVATE
    2 years ago by

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  19.  
    20. I am a new student in physics galaxy and am doing self study taking the help of this website for physics. Sir I had a doubt in illustrative example 1.5 of volume 3A. I am not able to understand how did we calculated the value of distance between the 2 masses A and B. Thank you
    2 years ago by

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  20.  
    21. Sir, shouldn't the effective acceleration of the particle in downward direction be g (qE/m)? But in the solution the effective acceleration in downward direction is given as qE/m. Thank you sir in advanced for replying to my query
    2 years ago by

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  21.  
    22. Nice
    2 years ago by

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  22.  
    23. Useful for jee 2022
    2 years ago by

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  23.  
    24. sir how did you determine E1 and E2 as I cap and J cap , in Module 31 it's not mentioned something like that
    2 years ago by

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  24.  
    25. sir in this question it is said that ideal spring and you have told that ideal spring does not oscillate??
    2 years ago by sushant Sathe

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  25.  
    26. Sir test charge can be any value of a very small magnitude or it's magnitude is taken exactly 1 only because in many books it is written UNIT positive charge.
    2 years ago by Snehil Mishra

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  26.  
    27. Respected sir. kindly let me know how the limits are from 0to90 I am unable to understand and take it from 0 to 180
    2 years ago by Sushmita Mandal

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  27.  
    28. sound is not available
    2 years ago by Divyanshu Kumar Purbey

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  28.  
    29. SIR how will be Period of motion,T=2t
    2 years ago by

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  29.  
    30. Sir how will be the period of motion ,T=2t
    2 years ago by

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  30.  
    31. Sir in the second last step, kC(L r)[-1/t], after putting the limits kC(L r)[(-1/r) (1/L r)] = kC(L r)(-L-r r)/r(L r) = -kCL/r I am not getting kCL/r
    2 years ago by Chaithanya S

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  31.  
    32. sir since lambda= Q/L and sigma=Q/A. we can write Q/A as Q/L*B= Q/L*1/B= lambda*1/B. so we get lambda= sigma*B. but you took lambda= sigma* area. I didn't get that. sir, can you please explain? It was my explanation. Am I wrong? thank you
    2 years ago by

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  32.  
    33. sir, how to find force between dipole and charged particle?
    2 years ago by Adith Pola

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  33.  
    34. sir, sometimes it gets really hard for us to grasp what you have done like you directly put some figures while we still focusing on the concept then it appears and we don't understand it. at least make us know that we are doing or putting these values from there. thank you
    2 years ago by

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  34.  
    35. sir I have a general problem ,not on this purticular video........sir actally when I again start this checklist it again starts from video 1...........for eg if I have watched 15 videos here and when I again open this checklist this starts from video 1..........so is there any way to directly switch to the desired video lecture??
    3 years ago by Devansh Verma

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  35.  
    36. Sir how non- metals can have positive ions....
    3 years ago by

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  36.  
    37. sir im working out your question after each topic and pyqs for revison of jee mains april session will it be sufficient ?? plz reply
    3 years ago by

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  37.  
    38. sir , how to know the direction of electric field due to uniformly charged rod.
    3 years ago by

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  38.  
    39. sir video ki speed ko kaise badhai
    3 years ago by shivam Kumar
    Ans 1 ->
    Speed increase option is oin youtube channel of Physics Galaxy
    2 years ago by

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  39.  
    40. Why is surface charge density more where the radius is small?
    3 years ago by Shayak Bhattacharya

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  40.  
    41. This Sum is not clear to me
    3 years ago by Arka Banerjee

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  41.  
    42. In this solution, you have taken the acceleration as qE/m. Why have you not accounted for gravity as in the previous example?
    3 years ago by Dhananjay Dhokarikar

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  42.  
    43. Good
    3 years ago by Syed Ateeb

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  43.  
    44. How do sin components get cancelled? Please help me sir
    3 years ago by RUDRAKSH SINGHAL

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  44.  
    45. How are the limits of integration r and r l?
    3 years ago by RUDRAKSH SINGHAL

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  45.  
    46. At 1:39, how is dq=(Q/L)dx?
    3 years ago by RUDRAKSH SINGHAL

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  46.  
    47. is this is sufficient for jee advanced
    3 years ago by Anshuman Tripathi

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  47.  
    48. Is the graph for electric field taught in the lecture
    3 years ago by Tiol Collflow

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  48.  
    49. how the 2 metal bodies will get neutralize after rubbing
    3 years ago by Aditi Singh

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  49.  
    50. so the pt P is not touching the surface of the disk sir.
    3 years ago by Kartik Parameshwaran

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  50.  
    51. sir even g will act in downward direction then we should take net acceleration as g qe/m know sir?
    3 years ago by somayajula sai sri harsha

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  51.  
    52. here dq should be (Q/R theta )d theta
    3 years ago by Aryan Dwivedi

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  52.  
    53. why the derivative of cosx is taken as sinx not -sinx?
    3 years ago by Aryan Dwivedi

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  53.  
    54. sir but charge is also a property of non metals i mean for ex- charge of fluorine F is-1
    3 years ago by

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  54.  
    55. at 1.23 seceonds you said force on 1 due to 2 will change ... i think so also said it will not .... please comment sir. THANK YOU!
    4 years ago by Vedant Rahul Patil

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  55.  
    56. sir i am not able to solve queset question i feel they are advance level and also not able to find their solution am i right
    4 years ago by basu jain

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  56.  
    57. sir why have you taken dE=integral(sin theta) as sin theta will be cancelled out. but in gravitation you have taken cos theta which os correct according to me. please explain please.
    4 years ago by Lavesh saluja

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  57.  
    58. sir in the above solved example why only the rsin(thteta) component will get cancelled but not rcos(theta) component?
    4 years ago by

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  58.  
    59. sir why we take the 6a in calculating potential at sphere A due to B,and c . I think we have have to take 5a
    4 years ago by ayush garg

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  59.  
    60. how the are of elementry ring is 2pxdx
    4 years ago by Naeem Khan

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  60.  
    61. or we have to add E^due each elemental ring carrying charge dq at a distance r
    4 years ago by vishalsingh Rajput

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  61.  
    62. sir why we first integrate whole charge inside inner sphere why we not able to directly integrate E^ as we can do in case of volume charge density varying in proportion to distance x
    4 years ago by vishalsingh Rajput

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  62.  
    63. sir why tension is taken as f radial / 2pi??
    4 years ago by shikha agarwal

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  63.  
    64. What should I do sir If I fail in solving questions in Queset even after watching the videos many times???
    4 years ago by
    Ans 1 ->
    Concepts ko baar baar revision karne ke baad retry... nothing comes without practice
    4 years ago by Hariharan Marimuthu

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  64.  
    65. unit positive charge hi kyun liya
    4 years ago by Ritik Jatav

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  65.  
    66. how period of motion T=2t?
    5 years ago by Kunj Technical

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  66.  
    67. Sir since protons can't move then how positive charge resides on outermost surface of metal.
    5 years ago by undefined
    Ans 1 ->
    electrons move away from outermost surface of metal increasing positive charge concentration in that region.
    4 years ago by Rohan Arya

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  67.  
    68. Sir, does it mean that we cannot charge a flat insulated plate?
    5 years ago by Ratan Sen

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  68.  
    69. Hi sir I have a doubt ,we are saying charge is invariant because it is related to mass,and mass is constant in any frame of reference,but when the electron is moving in speed of light,we have the relation E=mc^2,so now the mass varies ,then charge will also start vary?
    5 years ago by Harish R

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  69.  
    70. Sir, at 2:46 you have stated that 'initially all the positive charges are distributed uniformly on the metal sphere... But Sir, you have taught us in a previous lecture that charge in a conductor is distributed only on its surface. So, kindly clarify how uniform charge distribution throughout the metallic sphere is possible?
    5 years ago by Geeth Sagar

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  70.  
    71. Three semi infinite uniformly charged are kept perpendicular to plane of paper outward such that one end of each rod at AB and C on circle of radius r find E at centre ? The line charges are 120 degree away from each other
    5 years ago by Rizvan

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  71.  
    72. sir how can I download the module paper ?? that you have provided in between the videos?
    5 years ago by manish chhangani

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  72.  
    73. sir pls tell the alternative im not getting it.how can we think in the exam if it comes pls sir
    5 years ago by Sarju Panchal

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  73.  
    74. what is linear charge density??????
    5 years ago by Chandrani Dam

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  74.  
    75. what is g effective???????????
    5 years ago by Chandrani Dam

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  75.  
    76. What is the self energy of conducting cylinder
    5 years ago by shabareswar

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  76.  
    77. Here above when protons move right ,why it will not attract electron cloud?
    5 years ago by preetham dareddy

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  77.  
    78. sir Plz help me I am not receiving your notification of uploading video and solutions of the queries that I post on you tube
    5 years ago by Siddharth Aggarawal

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  78.  
    79. Sir some of the concepts in your videos are beyond the scope of neet ug.
    5 years ago by Sumit Kumar

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  79.  
    80. hello sir , sir you have changed the value of radius = 3, from cm to meter but you haven't change 20 cm to m and sir the final answer is 0.8 * 10^-8
    5 years ago by shreyaa chaudhuri
    Ans 1 ->
    because length of string will not change
    5 years ago by Yogesh Vashisth

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  80.  
    81. Sir ....pls mujhe aapke ke lecture notes book (amazon) ke baare me bata dijiye ...mujhe unhe kharidba hai...content kya hai unme
    5 years ago by Dharamjeet Singh

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  81.  
    82. Sir, how can we get the solutions of Quset ??
    5 years ago by Ramanuj dodiya

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  82.  
    83. (©=theta) If y = rtan© How dy = rsec^2©d© ? (w.ref.to electric field of uniformly charged long thread #electostats video no . 29)
    5 years ago by

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  83.  
    84. sir why we can not take gravitational forces into considration
    5 years ago by vikas agrawal
    Ans 1 ->
    Because these masses are so small that gravitational force between them will be negligible.
    5 years ago by singhaviral24@gmail.com

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  84.  
    85. sir what is a quark?
    5 years ago by saswat kumar sahu

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  85.  
    86. Sir i am having in cases circular concentrated shell problems...can you help me out to master it or any video is present on this illustration?. Please help me sir.
    5 years ago by osman ali

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  86.  
    87. SIR but POTENTIAL due to a dipole is given by kpsin@/r2
    5 years ago by Md Zakie Akhtar Ansari

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  87.  
    88. sir why have you taken mass in kg and distance in centimetre. I haven't understood it. plz clarify.
    5 years ago by Lalita Rani
    Ans 1 ->
    No he has not taken distance in cm he has converted in Metre watch video carefully
    5 years ago by singhaviral24@gmail.com

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  88.  
    89. sir why we use here cos@1+cos@2??but in previous section we use cos@2-cos@1!! please explain sir....this is problem of many of ur followers
    5 years ago by
    Ans 1 ->
    it will not be cos@2-cos@1 as it is not the component along the rod instead it must be sin@1+sin@2 as it is the component perpendicular to the rod . it was a coincidence that the and was 45° because of which (sin@1+sin@2) and (cos@2-cos@1) got the same value. suggeation:don't memorise the formula in therms of x and y axis. but memorise it in the form of normal component and component along the rod
    5 years ago by PURUVASU SINGH

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  89.  
    90. sir I'm not getting the answer when I'm differentiating potential energy. Where am i going wrong ?
    5 years ago by sandeep Neemkar

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  90.  
    91. can the medium of teachung can be done in any other medium like telugu
    5 years ago by Raman Kanduri RK

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  91.  
    92. yes here there must be the use of sintheta components
    5 years ago by vartika koli

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  92.  
    93. sir tends to zero he to sir e to infinity ho jayega
    5 years ago by vartika koli

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  93.  
    94. sir here in the question we are given that the particle is in space with electric field only therefore we should not consider g while calculating g effective
    5 years ago by Saurabh Agarwal
    Ans 1 ->
    Only is mentioned nowhere my friend
    5 years ago by Aman

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  94.  
    95. Sir why cant't force be increased. it should depend on the position of metal ball sir
    5 years ago by Kashif Ahmed

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  95.  
    96. What would happen if the body is not isolated?
    5 years ago by Vipul Mittal

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  96.  
    97. Sir,if it is a conducting sphere charges should be on surface.but here it is not the case,hence outer charges can produce electric field.am I right?
    5 years ago by Venkata Khatroth

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  97.  
    98. Sir,similar to the case of non conducting sphere,you took electric field due to outer charges is zero as it is inner point of cylinder.it is not a conducting sphere/cylinder to take electric field on inner surface to be zero.why outer charges don’t produce electricfield?
    5 years ago by Venkata Khatroth

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  98.  
    99. Why electric field at M is zero due to outer charges?you told consider it as hallow sphere but it is a non conducting sphere.
    5 years ago by Venkata Khatroth

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  99.  
    100. sir u said to attain equilibrium in 3 charges the charge should not be of same sign but when discussing stable and unstable equilibrium u are using all 3 charges have same sign how
    5 years ago by HARIPRASAD
    Ans 1 ->
    see hariprasad here stable and unstable equilibrium is dealt only for a single charge and in the latter video 12 three charges equilibrium is conidered. Do watch carefully. Hope your doubt is cleared. write further if thereis little confusion
    5 years ago by Lalita Rani

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  100.  
    101. Pls some one help me out how area of elementary ring is 2pxdx
    5 years ago by Aditya Kumar

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  101.  
    102. Sir how the area of elimentary ring is 2pxdx pls hlp me out
    5 years ago by Aditya Kumar

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  102.  
    103. Q. Three equal point masses(m)having equal charges(q)are hanged through 3 equal length(l)insulated string from common point of suspension.Find the angle subtended by one of the string with the vertical at stage of equilibrium
    5 years ago by Abc Xyz

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  103.  
    104. Sir, could you please add a video for deriving electric field due to an uniformly charged infinite sheet?
    5 years ago by Sibanarayan Moharana

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  104.  
    105. How can we calculate dq charge in any general question like to solve the electric field at the axial position of the ring
    6 years ago by Yuvraj Saxena

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  105.  
    106. Sir where I can find soln. Of Qeset if having doubt in some questions.
    6 years ago by Sumit

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  106.  
    107. EF at point M will be affected by outer shell or not? If not , then why ? please explain me.
    6 years ago by

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  107.  
    108. on return journey after colliding with the wall the acceleration of the block should be in opposite direction and equal to qE/m , therefore time taken in return journey should be more, then how can we just double the time taken to go from A to B to get total time?
    6 years ago by Tushar Sharma

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  108.  
    109. on return journey after colliding with the wall the acceleration of the block should be less than qE/m as electric field is in opposite direction
    6 years ago by Tushar Sharma
    Ans 1 ->
    but in return journey it has some velocity so that accn will take the object to rest , similar example to this question is free falling body which does elastic collision.
    5 years ago by aaditya chaturmohta
    Ans 2 ->
    so time will be same
    5 years ago by aaditya chaturmohta

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  109.  
    110. Sir why is there an uncertainity in the equality of Fb1 and Fb2 in the initial part of video ?
    6 years ago by Aakhyat Singh
    Ans 1 ->
    Oh no, my bad. I didnn't see the answer for the q below my q
    6 years ago by Aakhyat Singh

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  110.  
    111. why is the cos theta 2 + cos theta 1 is used here in one video say that soft eater 2 - cos theta 1
    6 years ago by Bhavika Badjate

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  111.  
    112. sir why cant we take value of x from dx to point p and then integrate it....
    6 years ago by Muskan sharma

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  112.  
    113. WHY dx=rsec squarethitha d thitha
    6 years ago by
    Ans 1 ->
    because we differentiated both sides w.r.t x
    5 years ago by aaditya chaturmohta

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  113.  
    114. Sir can u please tell me that what is charge ?
    6 years ago by Twinkle Gupta
    Ans 1 ->
    Charge is a property of a body by virtue of which it produce electric or magnetic field
    5 years ago by Hate Nation

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  114.  
    115. sir how to prove mathematically that vertical components will cancel out
    6 years ago by Dharamjeet Singh

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  115.  
    116. Sir, why is the strain delta R by R. The force acts only on the cross section of the ring right. Also, how are we sure that the ring expands in such a manner that its cross sectional area reamins constant.Cant the increase in radius be due to increase in cs area also. Thank you sir
    6 years ago by Abhishek Raghunathan

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  116.  
    117. E inside should be zero right?
    6 years ago by Sumukh Teja
    Ans 1 ->
    no , because it is not given that it is a metal cylinder
    5 years ago by vasudev kesharwani

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  117.  
    118. Sir, can u say is it important to mug up the final result of all these derivations .
    6 years ago by Prakash Raj

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  118.  
    119. Sir u told that strength of electric field is equal to MAGNITUDE of force, then how come it become a vector.
    6 years ago by Prakash Raj

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  119.  
    120. Who is dq=Q/L dx can you please explain sir?
    6 years ago by ojausmane
    Ans 1 ->
    SORRY!!. How is dq=Q/L dx can you please explain sir?
    6 years ago by ojausmane
    Ans 2 ->
    linear charge density= charge/length=Q/L
    6 years ago by Aditya Sargam
    Ans 3 ->
    Charge Q is spread in rod of length L so we are gonna apply unitary method as L --- Q dx --- (Q/L) dx here Q/L is linear charge density. when we multiply with dx we get the total charge in dx portion. after which we integrate to get our desired result. :)
    5 years ago by Rajarshi Agarwal

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  120.  
    121. Sir, If one body is a conductor and another is an insulator then which type charging concept will be used?
    6 years ago by Shrikrishna Namdeo
    Ans 1 ->
    friction electricity
    6 years ago by Prakash Raj

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  121.  
    122. There is an error of -ve sign in the result... Please check accordingly ???? Otherwise these video lectures are just unmatched and best in class They are simply immaculate and all thanks to Mr Ashish Arora Sir
    6 years ago by AAYUSH MAHAJAN

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  122.  
    123. Sir Please explain at 2:30,how D/2 = AT square/2 ?
    6 years ago by Nizam

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  123.  
    124. what happens to the charge inside a cavity of solid conducting sphere when sphere is placed in uniform and non uniform electric field respectively !
    6 years ago by ayush mittal

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  124.  
    125. sir why shold we take T=Frad/2p
    6 years ago by himanshu sharma

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  125.  
    126. as like charges when bought close repel more so more force is applied due to repulsion when compared to those which are placed far away
    6 years ago by teja

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  126.  
    127. sir in case1 i.e considering q2 ve and when displaced towards right then fR >fL since q2 is ve then more will be repulsive force on right side to left side
    6 years ago by teja

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  127.  
    128. Sir why is there an uncertainity in the equality of Fb1 and Fb2 in the initial part of video ? Around 1:44
    6 years ago by Jumo Sumo
    Ans 1 ->
    Since q1 and q2 are different , obviously . My bad .
    6 years ago by Jumo Sumo

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  128.  
    129. Sir in this problem if I use concept of limits the way we evaluate say we divide by x then we get answer zero.E is 0
    6 years ago by Vishal Mishra

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  129.  
    130. sir,in the very previous module discussing the equillibrium of 3 charged particles it was mentioned that equiilibrium can't be attainedif 3 charges have the same sign.then how come we justify the explination to the 1st case where all the three charges are positive?
    6 years ago by chaitanya sai krishna
    Ans 1 ->
    said that if equilibrium is only under electrostatic forces then the three charges must not be of same sign whereas in this video we have taken two side charges fixed (external force)... I hope you understand now...
    6 years ago by Prakash Raj

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  130.  
    131. can u tell me how limits are decided?i'm confusing with this and i don't know how to give limits .And also in finding surface areas of geometric fig, i'm unable to know what type of limits are given
    6 years ago by Abisetty Venkatesh
    Ans 1 ->
    For that, you need to study Area under the curve in maths
    6 years ago by ojausmane

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  131.  
    132. sir how you wrote linear charge density i didn't understood?????
    6 years ago by Rakesh singh

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  132.  
    133. Sir electric field in x direction should be -klamda/r as first angle is 0 and second angle is 90 so on substituting the value we get negative, how it is positive in yoUr answer ?????
    6 years ago by Rakesh singh
    Ans 1 ->
    even i hav the same doubt
    6 years ago by Prakash Raj

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  133.  
    134. Sir how we know the direction in which medium is applying force on these charged ??
    6 years ago by Rakesh singh

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  134.  
    135. sir when the charged rod touched with the sphere whats happen ??seperation of leaf becomes 0
    6 years ago by SAMIR MAHTO

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  135.  
    136. in slide 13 you have used three positive charges to explain equilibrium .but in the previous slide you said for three charges to be in equilibrium thier charges should be different.
    6 years ago by d varun kumar

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  136.  
    137. why the charges placed inside a conducting sphere comes out?
    6 years ago by Vidya Prakash

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  137.  
    138. Very nice
    6 years ago by Kamal Kumar Sharma

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  138.  
    139. why is it said that the three charges must not be of same sign? what if we take 1st,2nd,3rd all positive and keep 2nd at midpnt of 1st and 3rd..obviously 2nd will have same repulsion force in both the direction by 1st and 3rd than its in equilibrium as net force=0 than y is it said so?
    6 years ago by ADITYA ZALA
    Ans 1 ->
    only 2nd will be in eqbm and not all 3
    6 years ago by Prakash Raj

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  139.  
    140. Does your book have same illustration
    6 years ago by Girish Adhana

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  140.  
    141. electric field along -x axis =k(lambda)/r if we consider it above and below the wire wouldn't it add up to 2k(lambda)/r ?
    6 years ago by Gautham Shankar

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  141.  
    142. sir please provide the solution for qset 1 on electrostatics
    6 years ago by Dharamjeet Singh

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  142.  
    143. Why only gold leaf was used for the experiment
    6 years ago by Gunjan Arya

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  143.  
    144. How ds vecrtor was perpendicular to the surface ?
    7 years ago by Akshat verma

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  144.  
    145. sir as the line perpendicular to the plane exert force on the line in plane so the line in plane will also exert same force on line perpendicular to plane?
    7 years ago by kamal kaushik

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  145.  
    146. Why in the second sheet the positive charge in the metal conductor not distributed on its outer surface?
    7 years ago by Ardhendu Shekhar
    Ans 1 ->
    Look on it 3dimensionally ...of course it is distributed on the outer surface
    6 years ago by Prakash Raj

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  146.  
    147. should we mug the final results?
    7 years ago by sujith kumar
    Ans 1 ->
    even i hav d same doubt
    6 years ago by Prakash Raj

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  147.  
    148. Why the charge always resides on outer surface of the body
    7 years ago by Yash Shukla
    Ans 1 ->
    Due to mutual repulsion
    6 years ago by Prakash Raj

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  148.  
    149. THE CHARGE Q0 IS SLIGHTLY DISPLACED ALONG LINE JOINING OF TWO CHARGES.WILL IT PERFORM S.H.M. IF YES THEN FIND TIME PERIOD?
    7 years ago by NIRAV KAPADIYA
    Ans 1 ->
    electrostatic force/mass = acceleration for SHM acceleration = -omega sq. . dist. after getting omega time period = 2pie/omega
    7 years ago by Shubham Rangi

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  149.  
    150. Try to concentrate hear q1 is fixed and free to move so q2 will apply force on both q1 to move but due to we have fix q1 so it will not move and both q1 will apply equal and opposite force on q2 so it will remain in equilibrium.
    7 years ago by RAHUL DWIVEDI
    Ans 1 ->
    so you mean if both q1 are free to move then they will not be in eqilibrium ????
    6 years ago by Rakesh singh
    Ans 2 ->
    exactly rakesh
    6 years ago by Prakash Raj

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  150.  
    151. Why can't the negative charge be taken?
    7 years ago by Yukti Khosla

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  151.  
    152. If q2 is positive how can it be in equilbrium? The previous lecture told us that the sign of all of the charges cannot be same!
    7 years ago by Yukti Khosla
    Ans 1 ->
    Try to concentrate hear q1 is fixed and free to move so q2 will apply force on both q1 to move but due to we have fix q1 so it will not move and both q1 will apply equal and opposite force on q2 so it will remain in equilibrium.
    7 years ago by RAHUL DWIVEDI

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  152.  
    153. If the charges are of same magnitude and same distance of separation will equilibrium be maintained ?
    7 years ago by Yukti Khosla

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  153.  
    154. Can we say that it is based on the process of induction?
    7 years ago by Yukti Khosla

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  154.  
    155. Electrons cannot flow in insulators so only the rubbed areas of A & B should have negative & positive charge respectively?
    7 years ago by Yukti Khosla
    Ans 1 ->
    yes to my knowlege
    6 years ago by Prakash Raj

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  155.  
    156. How did we get E=kq/a^2?
    7 years ago by Yukti Khosla

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  156.  
    157. Sir, are there videos about the effective length when two charges are kept in two different media?
    7 years ago by PSai Krishna Kvmb

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  157.  
    158. sir net force should be given by 2Fcos(thetha) right?
    7 years ago by Shaun Noel

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  158.  
    159. Sir I have a question that can we do this problem using the torque
    7 years ago by Raghav G

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  159.  
    160. can this question be solved by finding electric field at the edge of disc using Gauss's theorem and then finding potential at that point?
    7 years ago by bristi bhattacharya

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  160.  
    161. WHY CANT'T WE USE VERY SMALL NEGATIVE CHARE AS TEST CHARGE?
    7 years ago by Pranav Dabhade
    Ans 1 ->
    If the source charge is positive it'll get attracted to the negative charge
    7 years ago by Yukti Khosla
    Ans 2 ->
    We can, but by convention, to define the direction of electric field absolute, we consider a very small positive test charge
    6 years ago by Kishore Sathia

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  161.  
    162. to explain direction of field why we used force experienced by positive charge which is outward means it is repulsive and due to positive charge instead of it why can't we use negative charge ton apply force on positive charge placed?
    7 years ago by Pranav Dabhade

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  162.  
    163. WHY IS COS THETA 2 PLUS COS THETA 1 USED HERE PLZ EXPLAIN IN SIMPLE LANGUAGE
    7 years ago by pratibha

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  163.  
    164. why is Q=lamda.pie.a
    7 years ago by pratibha
    Ans 1 ->
    because lamda is charge per unit length - lamda=Q/length of arc
    6 years ago by Rakesh singh
    Ans 2 ->
    because lamda is charge per unit length - lamda=Q/length of arc
    6 years ago by Rakesh singh

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  164.  
    165. Sir here u r integrating ring element from 0 to R. As EF at centre of ring is zero then why there is some EF at centre disc??? Why does expression comes out to be so??
    7 years ago by kunal sevkani
    Ans 1 ->
    this is because in case of a ring net magnitude of EF is zero as charges are present only around its circumference, but when a disc is taken a single ring is surrounded by other rings having charges present around it which doesn't let net EF be zero in a single ring.
    5 years ago by undefined

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  165.  
    166. sir how to find charges on 3 or 4 parallel plates after earthening any 1 or 2 or 3or all. similarly how to find charge flow between concentric shells connected with wire (concentric shells being more than 2)i am also facing confusion with potential and of concentric shells of which anyone is earthened. i want clear picture of theory regarding this . which book would you suggest or please include this topic in booster classes
    7 years ago by ariya
    Ans 1 ->
    That is already explained in the specific videos on what you are asking...
    7 years ago by Physics Galaxy

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  166.  
    167. Which playlist has the conceptual video for electric pressure?
    7 years ago by Subhadra Jena

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  167.  
    168. This positive charge might be a metal or nonmetal?
    7 years ago by Sudarshana Ghosh
    Ans 1 ->
    it can be anything...
    7 years ago by Physics Galaxy

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  168.  
    169. Sir please look at the qs.6 asked that what to do to get the static force if we have charge within 2 separate medium? Would the answer be that instead of e0 for vaccum we will write the product of the permittivity of those?
    7 years ago by Sudarshana Ghosh

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  169.  
    170. sir E1 should be kq/r (-cos@1-cos@2) ... ??
    7 years ago by Jigyasa Trivedi

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  170.  
    171. two charges 50microcoulombs and 100micro coulombs are seperated by 0.6m.then how to calculate the intensity of electric field at a point midway between them? and how to calculate the same in case of unlike charges?
    7 years ago by archana sabbarapu
    Ans 1 ->
    Use the result of electric field by point charges and find the vector sum of the two electric field results due to the two charges at the mid point... in case of same polarity charges, it will be subtracted and for opposite polarity charges it will be added...
    7 years ago by Physics Galaxy

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  171.  
    172. in electrostatics the surface and volume of a conductor is equipotential
    7 years ago by vishnuv
    Ans 1 ->
    Inside a conducting body always net electric field due to all the charges on body or outside the body is equal to zero and the region where net E=0, potential does not vary so the surface and volume of a conductor are always taken equipotential in reference of static charges....
    7 years ago by Physics Galaxy

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  172.  
    173. how can a ring of charge q treated as a poin t charge
    7 years ago by vishnuv
    Ans 1 ->
    A ring of charge q can be treated as a point charge on for an observer or at a point of application which is very far from the ring otherwise it cannot be taken....
    7 years ago by Physics Galaxy
    Ans 2 ->
    A ring cannot be treated as a point charge unless observed from a very far away point...
    7 years ago by Physics Galaxy

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  173.  
    174. sir why workdone in this video is Ui-Uf ?why not Uf-Ui?
    7 years ago by ariya
    Ans 1 ->
    As it is not the external work done... here we are calculating the work done by electric field.... and internal work by system forces is Ui-Uf which I have explained in the videos of basics of work-energy
    7 years ago by Physics Galaxy

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  174.  
    175. sorry sir why potential due it own q charge is not taken ?
    7 years ago by ariya
    Ans 1 ->
    because own potential will lead to self energy of other charge of dipole not the interaction energy...
    7 years ago by Physics Galaxy

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  175.  
    176. electric field at centre of a semicircle with linear charge density and radius a
    7 years ago by Alekhya

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  176.  
    177. HOW THE VALUE OF EPSILON ((PERMITTIVITY OF FREE SPACE)) ?? OR VALUE OF K= 9 * 10 ^9 IS DETERMINED?? IN DETAIL PLZ..
    7 years ago by nikhil
    Ans 1 ->
    it is an experimentel determined value, actully 1/4pienot is correct observation but for our calculations we are find out the apx value to be K= 9 * 10 ^9
    7 years ago by sankeerthmamidala

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  177.  
    178. Sir QuSet 1 on Electrostatics is not working. Please fix this.
    7 years ago by aayush upadhyay

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  178.  
    179. sir the result is kq/r (cos@2-cos@1) and u used it as kq/r(cos@1+cos@2) how sir ?????????
    8 years ago by Nipun Goyal

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  179.  
    180. Sir how can we calculate the force on an earthed conductor and a charge?
    8 years ago by Puneet Sarraf

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  180.  
    181. Sir QuSet 1 on Electrostatics is not working. Please fix this.
    8 years ago by RR

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  181.  
    182. if field lines are converging at origin, then is it right to write E=constant(r)? because my doubt is at r=0, E=0 i.e no field line exists , but it is given that field lines are converging at origin. if it is wrong how the problem would be?
    8 years ago by ramana sharma g

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  182.  
    183. for pointed conductors due to high charge density charge leaks to surroundings. the for sharp and pointed conductors charge density is high, so charge leaks to surroundings. Then is it correct to say charge resides at its surface?
    8 years ago by ramana sharma g

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  183.  
    184. which volume of physics galaxy contain electrodynamicselectrodynamics
    8 years ago by vimal kumar bhagwani

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  184.  
    185. when a comb is rubbed with dry hair it acquires a charge. but it disappears after some time. how??
    8 years ago by tarun agarwal
    Ans 1 ->
    due to humidity in air water molecules earth the charges
    7 years ago by vishnuv

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  185.  
    186. what happened when two charges are placed in two mediums and what formula is used to find the force between them?
    8 years ago by tarun agarwal
    Ans 1 ->
    dielectric constant is used
    8 years ago by rohit singh

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  186.  
    187. how a isolated conductor acquires charge?
    8 years ago by tarun agarwal
    Ans 1 ->
    a conductor which is isolated from surrounding can never acquire charge... it can be charged then isolated from surrounding...
    8 years ago by Physics Galaxy

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  187.  
    188. Is an isolated conductor neutral or charged?
    8 years ago by tarun agarwal
    Ans 1 ->
    it can be charged by any method then it can be isolated from surrounding...
    8 years ago by Physics Galaxy

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  188.  
    189. charge always resides over surface of conductors. Is this statement true for pointed conductors?
    8 years ago by ramana sharma g
    Ans 1 ->
    Its true for all conductors... in pointed conductors only the charge density is high where curvature of surface is small... you can watch all videos related to conductors in the concerned topic of video lectures...
    8 years ago by Physics Galaxy

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  189.  
    190. when one charge is placed in one medium and other in another one what is force between them?
    8 years ago by Nav Pathak
    Ans 1 ->
    use formula f/k
    5 years ago by SIVA CHUNDI

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  190.  
    191. Respected sir in the first video you had told that electric charges is quantised (they can be integral multiple only and expressed as N*q) so my question is how can the charge be tending to zero ?
    8 years ago by Amogh Varsha
    Ans 1 ->
    1g H consists of 1mole=2.023x10^23 atoms Means 2.023x10^23 electrons. If all were ionised Net charge = no of electrons x charge on 1 electron. So here sir is trying to say Charge tends to zero means reducing the no of electrons.Charge is still quantised.
    7 years ago by sahil sachdeva

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  191.  
    192. Sir isnt there more repulsion at the site of less radius
    8 years ago by Nitesh Guleria
    Ans 1 ->
    I think that the charges would be uniformly distributed but since radius is small even that same charge would be more dense
    7 years ago by Sudarshana Ghosh

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  192.  
    193. why a +ve charge electric feild is radially outward direction and to -ve charge electric feild is in radially inward direction?
    8 years ago by Mannepalli Vishwajeet
    Ans 1 ->
    because by the defenition of electric feild, it means force experinced by a unit positive charge IT IMPLIES FORCE IS EXPERIENCED BY POSITIVE CHARGE SO FEILD PRODUCED BY POSITIVE CHARE IS SAME DIRECTION OF ELECTRIC FEILD
    7 years ago by sankeerthmamidala

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  193.  
    194. sir if we take two oppositely fixed charges then where would the equilibrium occurs if we keep a -ve or +ve charge with them?
    8 years ago by Mannepalli Vishwajeet
    Ans 1 ->
    when we take two opposite nature fixed charges...the equilibrium is always attained outside the line joining the two charges..suppose we consider the left side charge to be +ve and right to be -ve... now if we take a +ve charge on outside the line joining them...then it would be in unstable equilibrium..and if we take a negative charge it will be in stable equilibrium....and you can check for the other way as well i.e.by changing the polarity of the fixed charges...
    7 years ago by shreya sood
    Ans 2 ->
    hope it helps!!!
    7 years ago by shreya sood

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  194.  
    195. why does not the charge tranfer from a to b to attain equilibrium?
    8 years ago by Mannepalli Vishwajeet

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  195.  
    196. in this illustration there are 10 e- what will happen if there are 9or any odd number of e- how will they equally divide and create a equilibrium.
    8 years ago by Samarth Mathur
    Ans 1 ->
    nice question
    6 years ago by Prakash Raj
    Ans 2 ->
    nice question
    6 years ago by Prakash Raj
    Ans 3 ->
    Maybe the e- will reside at the middle of the conducting wire
    6 years ago by Prakash Raj

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  196.  
    197. Sir I found a question in which a particle(mass m, charge q) is projected towards an infinite line of charge at an angle 30 degree with the normal to the line charge . how to find the closest dist of approach? Do I have to cons ang mom, if yes, about which point.
    8 years ago by Mohak Sharma
    Ans 1 ->
    The velocity of particle is v
    8 years ago by Mohak Sharma
    Ans 2 ->
    this problem can solved by maxima simple when the distance between the charge and line charge distribution is minimum then electrostatic force is maximum the derivative of force wrt distance is zero equate it and find Rmin the laws of kinamatics should be used because the parameter in this problem velocity
    7 years ago by sankeerthmamidala

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  197.  
    198. WHY dEsintheta won't be cancelled
    8 years ago by KAIKALA RAVI KUMAR
    Ans 1 ->
    review the above video once again
    8 years ago by Mannepalli Vishwajeet
    Ans 2 ->
    The considered point p is not equitorial to the rod and hence it is not symmetric, hence dEsintheta of both the sides wont cancel each other
    6 years ago by Prakash Raj

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  198.  
    199. sir how to find the force between 2 particles if both are kept in a medium of different dielectric constants??
    8 years ago by jeevan99

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  199.  
    200. .
    8 years ago by jeevan99

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  200.  
    201. sir, how is centre of positive or negative charge in a distorted atom is known
    8 years ago by Atul Gautam

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  201.  
    202. gold leaves of an evacuated electroscope has positive charge. if x-ray is passed through the leaves they will ----------
    8 years ago by janani

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  202.  
    203. sir can you explain how lambda=sigma.dy
    8 years ago by shabbir chatrissa
    Ans 1 ->
    because area of 1m length of the wire is (1.dy) and if we multiply it with surface charge density, it gives us the charge on 1m length of the elemental width wire....
    6 years ago by Prakash Raj

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  203.  
    204. sir you have not mentioned the direction of f net.
    8 years ago by Bibek Kumar Agrawal

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  204.  
    205. by this can i conclude that more electronegative body will get -ve charge
    8 years ago by Bibek Kumar Agrawal
    Ans 1 ->
    yes
    8 years ago by Aman Tiwari

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  205.  
    206. my question is that if we bring a positive charge near that neutral atom then why does the electrons are attracted towards that positive charge but not to the positive charge inside the nucleus??
    8 years ago by harshita madhukar
    Ans 1 ->
    Since electrons revolve around the nucleus in their respective orbits if they attract towards the nucleus where the proton lies the atom would no longer exist This is not possible.
    8 years ago by Rohan Khanna
    Ans 2 ->
    because electrons get delocalised in a lattice
    7 years ago by Rohit mishra
    Ans 3 ->
    it is because the electrons are constantly revolving around the nucleus so the centripetal force and the electrostatic force due to the nucleus will cancel out...hence the electron does not move towards the nucleus
    6 years ago by ABHISHEK SHANKAR

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  206.  
    207. How is this different from a uniformly charged long (as in infinitely long) rod ?
    8 years ago by Badhrinarayan Malolan

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  207.  
    208. Sir ,it will be highly helpful if you provide the detailed solutions of the practice questions provided.
    8 years ago by Ebin Sunny Varghese

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  208.  
    209. Sir, where have you taught the concept of solid angle? I'm not getting it. PLEASE HELP!
    8 years ago by Ashu Aman
    Ans 1 ->
    https://www.youtube.com/watch?v=4dtqXpssO9Y
    8 years ago by devesh sharma

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  209.  
    210. Sir please help me with this question. A uniformly charged cube of edge d has an electric field E at its corner. A small cube of edge d/2 is now cut from the charged cube. Prove that the electric field at the corner of the small cube due to itself is E/2
    8 years ago by Mohak Sharma

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  210.  
    211. Sir one question sir how to find electric field strength at a distance x from the axis of a disc which is rotating with a uniform angular velocity omega.
    8 years ago by sourabh jangid

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  211.  
    212. sir why dnt we substitute limits from +L/2 to - L/2 ?
    8 years ago by vishwanath v pai

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  212.  
    213. why charge is quantized or which property of the charge makes it to be quantizised?
    8 years ago by sanjanasanikommu
    Ans 1 ->
    q=ne The quantization of physical charge meansit cannot vary continuosusly and cannot take any arbitrary value.but it can change discontinuously to take any one of discrete set of values for eg.a building can have different floors(1st 2nd etc)but it cannot have a value in between like 1.5. similarly electric charge is quantized.the minimum amount by which a physical quantity can change is called 'quantum'. It is found experimentally that the electric charge of any body large or small...is always an integral multiple of a certain minimum amount of charge.i.e the basic charge of an electron
    8 years ago by REEMA S
    Ans 2 ->
    In NCERT part 1 class 12 Preface it is mention Physics never answers Why . You Question is dealt by a Field named ' Meta Physics '
    8 years ago by Ashish Sharma
    Ans 3 ->
    @ashish sharma actually physics can answer why because in NLM almost all questions havw WHY in them
    8 years ago by SAI SMARAN S B

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  213.  
    214. Sir why did not you include g in a (acceleration) like in previous question
    9 years ago by Priyanshu Varshney

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  214.  
    215. sir can we do it by calculating integral(E.dr) ???
    9 years ago by Sushabh Deshmukh
    Ans 1 ->
    Yes, it can be done... But for that you need to first calculate E(r) then use integral E.dr from infinity to surface then surface to r...
    9 years ago by Physics Galaxy

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  215.  
    216. Dear Sir My question is that what will happen if we place a dielectric slab having some thickness between two like point charges ?
    9 years ago by Akshat Jain
    Ans 1 ->
    The force acting on each of the point charge will increase due to the induced charge on the slab...
    9 years ago by Physics Galaxy

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  216.  
    217. Sir but electric field at the centre of uniformly charged hemispherical cup is 2.pi.K.sigma na ????
    9 years ago by Sushabh Deshmukh

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  217.  
    218. Sorry sir i just found that my wifi is slow ..
    9 years ago by Rahul Ganotra
    Ans 1 ->
    a
    8 years ago by Saurabh Ojha

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  218.  
    219. Sir please change the video camera settings as most of the videos are not clear ...
    9 years ago by Rahul Ganotra
    Ans 1 ->
    Sorry sir l just found that my wifi is slow .
    9 years ago by Rahul Ganotra

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  219.  
    220. Sir total downward force should be equal to mg + qE right ? How did the expression g + qE/m come ?
    9 years ago by Rahul Ganotra
    Ans 1 ->
    Rahul g+qE/m is the effective acceleration due to gravity in the electric field not the force.
    9 years ago by Priyanshu Varshney
    Ans 2 ->
    here weight of body is equal to mg(eff)=mg+qE so g(eff)=g+qE/m
    8 years ago by Ayush Singh Rajput

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  220.  
    221. How the restoring force is 2Fcostheeta?
    9 years ago by Rahul Ganotra
    Ans 1 ->
    hello rahul.we have learnt in 11th std that the resultant of two vectors a & b is given by r= root over a^2+b^2+2abcos theeta.if a=b then r comes out to be 2acos theeta/2.
    9 years ago by harshvardhan shukla
    Ans 2 ->
    he has simply taken the component of F which is Fcos theeta due to one and due to both the cos theta component will be added up and so is the restoring force is 2Fcostheeta ..
    7 years ago by shreya sood

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  221.  
    222. Sir do we have to convert 1cm to m and 20cm to metre inorder to find tan theeta ?
    9 years ago by Rahul Ganotra
    Ans 1 ->
    dont cnvert !! its a ratio .. so obviosly even if u cnvert the cnvertion factore will cancel off in d numerator & denom ! or m/m=cm/cm implies unitless !!
    8 years ago by vishwanath v pai
    Ans 2 ->
    Salute to your reply vishwanath v pai
    6 years ago by Prakash Raj

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  222.  
    223. we all know that area is a Scaler quantity than why in gauss law we take it as a vector quantity
    9 years ago by Saksham Jain

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  223.  
    224. I did not understand the meaning permittivity or free space medium and relative permittivity . Please explain me in easy way . And even the meaning of dielctric constant ?
    9 years ago by Rahul Ganotra

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  224.  
    225. how to find maximum charge that can be given to a spherical conductor
    9 years ago by Manik
    Ans 1 ->
    when charge is given to any spherical conductor more than its max value then dielectric breakdown takes place of the medium in which the spherical conductor is placed and hence the dielectric medium also behaves as a conductor due to which charge of the spherical conductor can leak.[watch the complete vdo lectures of electrostatics to clear this concept ]
    8 years ago by harshvardhan shukla

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  225.  
    226. Why does transfer of charges say electrons take place from a charged body to an uncharged body when a metal wire is connected . Why does the charge not further transferred when both the bodies attain same number of electrons/charges?
    9 years ago by Rahul Ganotra
    Ans 1 ->
    its the concept of equilibrium.
    9 years ago by Steve Islary
    Ans 2 ->
    to remain in equilibrium exchange of charge is necessary
    9 years ago by Saksham Jain
    Ans 3 ->
    metals show the property by which charge is uniformly distributed over the surface.also charge dbodies are unstable and try to reduce the charge over them.two bodies will have equally charge transferred between them only if they are made of same material.
    8 years ago by REEMA S

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  226.  
    227. sir your lectures are very good i think the ans is kcl/r + kcln(r/r+l) because the value of x is L+r-t please check it
    9 years ago by George Gregory

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  227.  
    228. elemental strip which is considered here is a ring. now vary the vary the value of pie from 0 to pie/2 then you will see hemisphere is made of elemental rings of radius varying from 0 to R
    9 years ago by srinivas

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  228.  
    229. Sir, why would the sine component cancel out.....i mean which symmetry argument did u use to say this...pls help!!
    9 years ago by rajat puri
    Ans 1 ->
    Here as cos (theta) is an even function so all element above and below the horizontal diameter of the ring will have symmetric charges hence sin (theta) will cancel out.
    8 years ago by vishwanath v pai

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  229.  
    230. According to the charge distribution on an isolated conductor the maximum charge accumulates on the edges where the radius of the curvature is quite small so in a twisted pair of metal wires where will the highest amount of charge accumulate?
    9 years ago by Yash Selot

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  230.  
    231. Why is a charge invariant?
    9 years ago by Yash Selot
    Ans 1 ->
    Charge invariance refers to the fixed electrostatic potential of a particle regardless of speed. For example an electron has a specific rest charge.
    9 years ago by Manik

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  231.  
    232. dear sir my question is if charges in motion creates both electric and magnetic field then in the bohr's theory of hydrogen atom as electron is revolving around the nuclues then how only coulomb's law is accounted for centripetal acceleration even magneetic force should be considered why it is not done
    9 years ago by srinivas
    Ans 1 ->
    But magnetic field affects only moving charges(F=q(v*b)) And the nucleus is stationary.. So magnetic force is zero ...
    8 years ago by Sudharsan Sundar
    Ans 2 ->
    PLz check it out even the nuclues also revolves.
    8 years ago by srinivas
    Ans 3 ->
    Rotational speed of nucleus is negligible .. Hence it was neglected by Bohr . Even the schrodinger eqn can be solved after taking the approximation that rotational speed is low..So the magnetic force is not taken into account ...
    8 years ago by Sudharsan Sundar

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  232.  
    233. Sir is the electric field strength at the surface of any shaped metal with surface charge density sigma equal to sigma/absillin? If yes can you please explain why
    9 years ago by Mohak Sharma

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  233.  
    234. Sir in your lecture book you stated that equilibrium of charges only under electrostatic forces is always unstable.Why?
    9 years ago by govinda totla

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  234.  
    235. Sir in your lecture book you have corrected both the solutions .please explain the correct one.
    9 years ago by Aditi Gupta

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  235.  
    236. Sir why u have taken limits from 0 to pie/2 and not from -pie/2 to pie/2 ?
    9 years ago by Aditi Gupta
    Ans 1 ->
    elemental strip which is considered here is a ring. now vary the vary the value of pie from 0 to pie/2 then you will see hemisphere is made of elemental rings of radius varying from 0 to R
    9 years ago by srinivas

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  236.  
    237. sir why INCREMENT IN TENSION=[F/2#]? #-REFERS TO PIE=22/7=3.14
    9 years ago by kadaru sahith

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  237.  
    238. sirhow can we precisely say dat the F(m) ... ie frce exerted by d medium is attractive in d direction of line joing d two forces ?
    9 years ago by vishwanath v pai
    Ans 1 ->
    You can draw the configuration of induced dipoles in surrounding of charge and verify this...
    9 years ago by Physics Galaxy
    Ans 2 ->
    Even after drawing the configurations, some dipoles on the left side exerts a force which is oppposite to d direction of d line joining 2 forcs
    6 years ago by Prakash Raj

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  238.  
    239. sir but u tld dat the charges should nvr b of the same sign for 3charges to b in equilibrium know .
    9 years ago by vishwanath v pai
    Ans 1 ->
    Yes if three charges are free then its not possible but in above video you can see side charges are fixed...
    9 years ago by Physics Galaxy

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  239.  
    240. why can not we charge metals using the method of friction?
    9 years ago by Anup
    Ans 1 ->
    metals are good conductor so even if these are charged...due to contact it will discharge..
    9 years ago by Physics Galaxy

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  240.  
    241. state and prove gauss theorem in electrostatics
    9 years ago by thota sunil raj
    Ans 1 ->
    It is explained in videos... pl watch all videos carefully..
    9 years ago by Physics Galaxy

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  241.  
    242. why crrent flow in direction of positive charge?
    9 years ago by harsh raj
    Ans 1 ->
    current always flows from lower potential to higher potential e.g. suppose two points on conductive wire A and B which have voltage 3v and 5v respectively then current flows through A to B due to potential difference
    9 years ago by ayush pathak
    Ans 2 ->
    Current flow is taken in the direction of flow of positive charges as convention... to consider what ayush has written...
    9 years ago by Physics Galaxy
    Ans 3 ->
    According to convention positive charges do not flow because they are embedded in the nucleus but negative charges are free to move i.e. ELECTRONS. so when a potential difference is generated electrons start moving from higher potential to the lower potential. this generates electric current in opposite direction ( opposite to the direction of flow of electrons)
    8 years ago by ABHISHEK BANGA

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  242.  
    243. Respected Sir, How to find the force between two charges placed in different medium.
    9 years ago by Kuljeet Singh
    Ans 1 ->
    That can be done by considering polarization vector in each medium... you can refer the book... Basic Laws of Electromagnetism by IE IRODOV... not covered at this level in my videos...
    9 years ago by Physics Galaxy

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  243.  
    244. Respected Sir, Can u explain the force between two charges placed in different mediums(media) at some distance?
    9 years ago by Kuljeet Singh
    Ans 1 ->
    force is decreses by permittivity of medium.
    9 years ago by Rahul Sharma

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  244.  
    245. A point charge 50 micro coloumb is located in X-Y plane at the point of position vector r=2i+3j. What is the Elcetric Field at r=8i-5j.
    9 years ago by Pawan Balgi
    Ans 1 ->
    You can use the vector form of Electric field due to a point charge to obtain this...
    9 years ago by Physics Galaxy

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  245.  
    246. Hello Sir, Why some of the videos are not clearly visible??
    9 years ago by Dr.Madhu Sharma
    Ans 1 ->
    go to settings option in you tube and make the quality from 144p to 360p
    9 years ago by Vineet Chatterjee

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  246.  
    247. do you have advance illustrations for only electrostatics ?what abt other topics ? we adore your work in this area.absolutely wonderful
    9 years ago by ramesh nagda
    Ans 1 ->
    All topics have adv illustrations... now available..
    9 years ago by Physics Galaxy

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  247.  
    248. SIR, HERE YOU ARE CALCULATING ELECTRIC POTENTIAL IN PLACE OF ELECTRIC FIELD.
    9 years ago by VIJIT KANJILAL
    Ans 1 ->
    ITS ELECTRIC FIELD MY DEAR.
    9 years ago by VIJIT KANJILAL

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  248.  
    249. dear ashish sir, i am abhishek jain from S1X batch in ALLEN.I am not able to follow extra books on regular basis.Can you please give me some tips how to manage my time accordingly so that i am able to follow the books regularly. In physics galaxy i am on projectile motion. In hcverma i am on forces. in irodov i am able to follow regularly. in university physics i am on rectilinear motion. i am doing class modules regularly
    9 years ago by Abhishek Jain
    Ans 1 ->
    bro one advice for the full 1st yr just follow two books and that too one to read concept and get thorough with basics(i prefer NCERT books or HC verma) and to solve problems follow one book(HC verma or DC pandey or solve QU set of physics galaxy lectures) make sure you know all the basics and your through wiht concept of both 1st yr and 2nd yr syllabus and make sure you complete the full book which you followed for problems In revision time you dont need to solve low level problems you pick up a book like Irodov or Kroto or Resnick Halliday Walker or brainstormes of physicsgalaxy.com which contain high level problems and start solving them and then finish!!
    8 years ago by Charan Sai

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  249.  
    250. RESPECTED,SIR. ANSWER MY QUESTION. HOW WE CAN FIND ELECTRIC FIELD AT THE CENTRE DUE TO 1/8 PART OF SOLID SPHERE OF RADII 'R'
    9 years ago by Patel Mitul .A.
    Ans 1 ->
    By considering an elemental curved surface with centre at the centre of sphere and integrating it.. But for this you first need to calculate the result of it separately by integrating elemental arcs over its surface...
    9 years ago by Physics Galaxy

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  250.  
    251. sir how to buy your video lectures offline
    9 years ago by vaibhav gupta
    Ans 1 ->
    Right now video lectures are available online for free... offline version will be available soon..
    9 years ago by Physics Galaxy

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  251.  
    252. Electric potential is given by V = 6x - 8xy-8y+6yz-4z then electric force acting on a point charge of 2c placed at origin will be?
    9 years ago by Punyashlok Bhargav
    Ans 1 ->
    I think ...answer is zero!!! bcoz in given problm. for the particle at the origin......x=o, y=0, z=o so....zero?
    9 years ago by TISTA LATHER
    Ans 2 ->
    If we partially differentiate V,we get the value of Electric field at origin ,ie- E=-[(6-8y-0+0-0)+(0-8x-8+6z-0)+(0-0-0+6y-4)].On substituting values x=0,y=0,z=0 we get ELECTRIC FIELD=6 N/C. Thus force on 2C charge is given as 12N......
    9 years ago by Shivaranjan K Menon

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  252.  
    253. A uniformly charged thin spherical shell of radius R carries uniform surface charge density of K /area. It is made of hemispherical shell, held togetherby presing them with force F. F is proprotional to ( JEE 2010). In this E by hemispherical shell is taken as K/2 epsilum or K/4 epsilum
    10 years ago by vijay
    Ans 1 ->
    (a+b)(a+b)=a.a+b.b+2a.b
    8 years ago by jeevan99

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  253.  
    254. Respected Sir ,why can't we place a +ve charge for C outside the line joining the charges which can still keep the charges at rest?
    10 years ago by manish
    Ans 1 ->
    All positive charges will repel ans system will be unstable..
    9 years ago by Physics Galaxy

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  254.  
    255. what happens to volume of body when it became positively or negatively charge?
    10 years ago by rajat rathi
    Ans 1 ->
    If we talk about a bubble with volume V.If -ve charge given to it then it will shrink due to force acting on it towards center as electric field tends inside for negative charge.
    9 years ago by MOHIT SHARMA
    Ans 2 ->
    it remains same ...............!
    9 years ago by Karthikesh
    Ans 3 ->
    I think that the volume of the body will not change as the volume of electron is comparatively negligible to that of the whole body so there is no change in the volume of the body.
    9 years ago by Yash Selot
    Ans 4 ->
    yash! we were not talking in macroscopic level. we were just talking in atomic level.therefore we cant neglect electronic mass.
    9 years ago by SIDDHARTH PRADHAN
    Ans 5 ->
    volume remains unchanged but I think mass changes due to loss and gain of charges.
    9 years ago by Steve Islary
    Ans 6 ->
    as electron also have mass therefore when object get positively charge there will be loss in mass and when negatively charge it will gain mass but as the mass magnitude of electrons are 9.1* 10^-31 threfore loss in mass will be negligible
    8 years ago by ROSHAN
    Ans 7 ->
    constant =density=mass/volume.if mass increases(addition of electron) volume increases .if it is positively charged volume decreases.But this is a theoretical hypothesis.practically since mass of electron is too small.it is almost undetected by the ordinary instruments.
    8 years ago by REEMA S

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  255.  
    256. Sir please explain why you have taken limits as R to infinity in case of elemental ring and -infinity to +infinity in case of a strip?
    10 years ago by Akhil Mehta
    Ans 1 ->
    As to make the whole sheet rings are to be varying in size of 0 radius to inf radius where as when we place strips one after another to make the whole sheet we need to consider strips from - inf to +inf...
    9 years ago by Physics Galaxy

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  256.  
    257. why friction electricity is not a good method for charging metals??
    10 years ago by sanjiv kumar tiwari
    Ans 1 ->
    Because the charge is distributed again by conduction
    9 years ago by Karthikesh
    Ans 2 ->
    metals are good conductor so even if these are charged...due to contact it will discharge..
    9 years ago by Physics Galaxy

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  257.  
    258. when a charged body is placed in contact with a nonmetal body ( wood etc.) , will it make the wood also charged . If yes, how is this possible as charge can't travel in wood? please explain
    10 years ago by Shubham Jain
    Ans 1 ->
    non conductor will not be charged just by contact... you need to rub the body so that due to friction it will get charged...
    9 years ago by Physics Galaxy

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