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

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  1.  
    2. Can't we play the videos at 1.5x or 2x in app
    2 years ago by Shivam

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  2.  
    3. love you sir..... pranam
    2 years ago by JAY HIND JAY IAS IPS

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  3.  
    4. Sir please give us playback speed controlling options to watch videos on 1.5x,1.75x,2x & 2.5x ??
    2 years ago by Meer Raj.

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  4.  
    5. when we are transferring a charge from B to A, B should be positively charged right, how is B becoming negatively charged
    2 years ago by Govardhan

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  5.  
    6. when we are transferring a charge from B to A, B should be positively charged right, how is B becoming negatively charged
    2 years ago by Govardhan

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  6.  
    7. in what condition we use integegration and differentiation
    2 years ago by nisha soni

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  7.  
    8. I couldn't understand the respective dielectric slab areas?
    2 years ago by Dibyojyoti Bhattacharjee

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  8.  
    9. How to understand that potential difference is (V-X) or (X-V) ?
    3 years ago by Sanad Chandrasekhar Singh

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  9.  
    10. Please Provide Derivation For - Qi = q×(1 - 1\k)
    3 years ago by Aryan Jain

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  10.  
    11. Sir in the case of infinity ladder network if initially x is the equivalent capacitance say if the each capacitance in the network Is doubled then the whole network arrangement has the equivalent capacitance 2x but how? give explanation sir please
    3 years ago by

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  11.  
    12. sir what is leaking of charge in general
    4 years ago by PASAPULA SURYA

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  12.  
    13. how is energy stored by battery zero? I didn't get it.
    4 years ago by shrutik patil

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  13.  
    14. sir, how are the capacitors connected in parallel? rhey seem to be in series .. please reply
    4 years ago by Pankaj Mahajan

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  14.  
    15. sir if there are four plates 1,2,3,4 in which 1 and 4 are connected to a common terminal A and 2 and 3 are connected to a common terminal B then what will be the equivalent capacitance .
    4 years ago by Aman Jian
    Ans 1 ->
    answer is 2C .
    4 years ago by Aman Jian

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  15.  
    16. sir can this ques be solved by the mirror method
    4 years ago by

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  16.  
    17. how cani meet u sir?
    5 years ago by Sarju Panchal

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  17.  
    18. superb method
    5 years ago by Sarju Panchal

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  18.  
    19. best teacher
    5 years ago by Sarju Panchal

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  19.  
    20. east or west ashish sir is the best
    5 years ago by Sarju Panchal

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  20.  
    21. are advanced Illustrations enough for JEE advanced
    5 years ago by idrees Manzoor unvisited places

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  21.  
    22. sir case 1 me capacitance k times kyu hoga... agar potential (v) change nhi hua hai to.. kyuki capacitance C=Q/V hota hai aur agar V remains same hai to capacitance k times kaise hoga??? plzz reply
    5 years ago by Avinash Kumar
    Ans 1 ->
    bro C'=(A*epsilon*K)/d and we know that before insertion C=A*Epsilon/d therefore C'=KC
    5 years ago by Sarju Panchal

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  22.  
    23. Sir can we consider the charge from the facing plates of the bottom capacitors to be equal to the charge flown to the facing plates of the top two capacitors?
    5 years ago by Arka Seth

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  23.  
    24. Respected sir, why Vb comes out to be zero? please elaborate.
    5 years ago by HRIDASPANDANA RAJMEDHI

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  24.  
    25. sir why did you take the elemental capacitor in that position ? you can also take it as you have taken it in the previous illustration no 33
    5 years ago by Md Zakie Akhtar Ansari

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  25.  
    26. Sir it's a general question not about video.plz tell me is it beneficial to buy your book for IPHO/IIT .apart the fact I watch all your lecture.
    5 years ago by dev Agarwal

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  26.  
    27. Can you tell me where is concept videos
    5 years ago by Swetha rao
    Ans 1 ->
    you have to go on the contents and then click to the video lectures
    5 years ago by Md Zakie Akhtar Ansari

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  27.  
    28. how did force on the dielectric slab equals du/dx
    5 years ago by Adarsh raj

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  28.  
    29. how to pg education live classes online
    5 years ago by

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  29.  
    30. sir we cannot solve this by adding potential method in denominator
    6 years ago by Priyanshu Singh

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  30.  
    31. Thank you sir
    6 years ago by K.S.Sreevatsan

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  31.  
    32. Sir , how can I get your notes of capacitor.
    6 years ago by Anurag Pal

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  32.  
    33. How to post images of questions??
    6 years ago by Rahul Pandey

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  33.  
    34. please provide solutions to QuSet- 1 on capacitance
    6 years ago by Laharee Ghosh

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  34.  
    35. Sir , isn't d between plates also variable ???
    6 years ago by PRANAV SINGHAL

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  35.  
    36. sir,can you relate the definition of breakdown potential to the qmax?
    6 years ago by Nallam Suraj

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  36.  
    37. sir at capacitor C2 on plate having charge -Q2 ,why final charge is q2f and at Q2 why it is -q2f ?
    6 years ago by akshat jain

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  37.  
    38. sir , why there will be a inward force on dielectric ?
    6 years ago by akshat jain

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  38.  
    39. can we do like this, F= E(1-1/k)A F=q/ e0 but how can we do it without considering polarising effect
    7 years ago by Pratyush Ranjan Roul

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  39.  
    40. sir, can u please tell us how can we apply gauss law to prove the same!!
    7 years ago by Pratyush Ranjan Roul

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  40.  
    41. Sir, Why potential is minimum at the place where E is maximum ?
    7 years ago by Pratyush Ranjan Roul

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  41.  
    42. Please make clear y and 100-y points. x and 100-x points are understandable. Overally the topic of symmetry doesn't give enough confidence as compared to your other lectures.I tried reading many pdfs but couldn't get a source that gives enough explanation for symmetry circuits.
    7 years ago by Rakesh Bhattacharjee

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  42.  
    43. Sir Sometimes you take 2(V-x)=120 and sometimes 4x + 6(x-V)=0 How would i decide the direction because if i take 2(x-V)=120 i get the negative answer. Please reply soon.
    7 years ago by Ashok Kumar

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  43.  
    44. Sir why are u considering x at the second junction? Can we consider it as 20 volt?
    7 years ago by sachin
    Ans 1 ->
    No as reference 0 can be taken only at one point in the circuit...
    7 years ago by Physics Galaxy

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  44.  
    45. sir why dont you take breadth as d
    7 years ago by karan parekh
    Ans 1 ->
    because d is the plate separation... not breadth...
    7 years ago by Physics Galaxy

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  45.  
    46. sir why there is no RC circuit analysis
    7 years ago by ariya
    Ans 1 ->
    RC Circuits are there in the topic of current electricity... pl goto the concerned section, you will find many videos there...
    7 years ago by Physics Galaxy

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  46.  
    47. can we apply nodal analysis for non isolated conductor
    7 years ago by Anurag Dalmia
    Ans 1 ->
    The basic concept behind application of Nodal Analysis is conservation of charge & for this to be possible system must be isolated
    7 years ago by Bhuvnesh Garg

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  47.  
    48. Sir when we apply nodal analysis we take the charge of the isolated conductor 0 but if the plates making isolated conductor contain initially some charge then how we will do nodal analysis
    7 years ago by Anurag Dalmia
    Ans 1 ->
    The basic concept behind application of Nodal Analysis is conservation of charge & for this to be possible system must be isolated, in order to write the equation we apply Initial charge = Final charge, if initially conductors of isolated system is neutral then only we substitute value of Initial Charge=0 otherwise whatever value of charged isolated system is given , we need to substitute that value
    7 years ago by Bhuvnesh Garg

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  48.  
    49. what is the sound at the back at 0.38 sec
    7 years ago by pawn kumar

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  49.  
    50. Respected sir .. the solution given here is not right. We have to find the equivalent capacitance one with water and then with air then using the energy formula we will evaluate the potential energy ...after that we will find the force by taking the derivative of potential energy and equate it to pgh to find the height. Please check my solution .and correct me if I'm not doing it correctly with due respect..... Tathagat. Ps the answer generated by my solution does not match the answer generated by the solution above .
    8 years ago by Tathagat saxena
    Ans 1 ->
    Got my mistake conservation of energy cannot be applied for unaccounted energy losses ..... Pardon me for the above comment ( I only read the problems and refer to solutions only when I'm not able to solve them .. I didn't go through the solution until the end)
    7 years ago by Tathagat saxena

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  50.  
    51. Quset is not working
    8 years ago by Aloke Das

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  51.  
    52. sir how can the two capacitors be considered in series as there is a battery between them on either side ?
    8 years ago by vishal

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  52.  
    53. sir for this problem you took the first nodal analysis as 2x+2x+2(x-40)=0. why we cant take 2x+2x+2(40-x). is there any problem?
    8 years ago by sagar choudhury

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  53.  
    54. 2250 is increment in internal energy how is that the heat produced?
    8 years ago by Rajat Bhadoria

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  54.  
    55. sir capacitance???
    8 years ago by harshit
    Ans 1 ->
    q/v v-as calculated???
    8 years ago by harshit

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  55.  
    56. sir upper limit may be d-2r
    8 years ago by BRIJ KISHORE SHARMA

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  56.  
    57. why charge goes out if electric field exceeds breaking strength.
    8 years ago by hemanth goud
    Ans 1 ->
    because at that strength charge goes out from the body because that force start to make ions in the surrounding medium
    8 years ago by Abhijeet Shukla
    Ans 2 ->
    dielectric strength or breaking strength as u call it is the max value of electric field which a medium can withstand, after attaining this much electric field, the medium breaks down or as has been said above ions are made. and hence the electric discharge through the medium.
    8 years ago by ANURAG KAUSHIK
    Ans 3 ->
    what do u mean by electric discharge in medium i want to know why charge cant reside on body after the electricfield of surrounding exeeds breaking strenght.
    8 years ago by hemanth goud

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  57.  
    58. sir If charge has to reside on the surface of the conductor then here how do we explain that outer sphere carries charge in side only...
    8 years ago by syam sunder

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  58.  
    59. sir really i unable to understand .... If we consider electric field due to both the plates as you mentioned in previous lectures as both the plates are conductors the answer should be 2sigma/epsilon 0..... is it not so..
    8 years ago by syam sunder

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  59.  
    60. Sir how are you assigning potential at the cube
    8 years ago by ankit kumar r sharma
    Ans 1 ->
    potential is relative term, we take it zero at infinity for reference, and u can assign any suitable and convenient value for ur calculations.
    8 years ago by ANURAG KAUSHIK

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  60.  
    61. sir...as charge is going from cylindrical shell B to A we should use expression V(a)-V(b)= - integration from r1 to r2 E.dx?(minus sign before RHS)
    8 years ago by Siddhant Tomar
    Ans 1 ->
    OKAY..i got it
    8 years ago by Siddhant Tomar

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  61.  
    62. sir can we still use charge conservation in this case even when the plates are not isolated?because we have batteries attached in between them.
    8 years ago by Vaishnavi Kulkarni
    Ans 1 ->
    Yes.Nodal analysis is based on charge conservation only.Summation of charges of cap about a node is zero.
    8 years ago by

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  62.  
    63. sir can you please tell me how the potential on other plate will be (x+20) sir ahould'nt it be (20-x)? thank you.
    8 years ago by Vaishnavi Kulkarni
    Ans 1 ->
    It will be 20+x as the potential drop across the the battery should be 20 v.So 20+x -x=20v satisfies the theory.
    8 years ago by
    Ans 2 ->
    sir how can the two capacitors be considered in series as there is a battery between them on either side ?
    8 years ago by vishal

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  63.  
    64. Why the conducting spheres must be largely separated wrt radii of spheres?
    8 years ago by Sai charan
    Ans 1 ->
    because if the the spheres are not largely separated wrt to the radii of the spheres then we also have to take account of the electrostatic potential energies b/w the two spheres
    7 years ago by shubham

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  64.  
    65. Sir please tell me when can we isolate a junction as it is done in the alternative method
    8 years ago by Mohak Sharma

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  65.  
    66. Sir i considered one of the parallelograms inscribed in the figure to be a wheatstone bridge and got the right answer but can it be considered wheatstone bridge because another wires are touching one of its junctions.the wheatstone bridge is not free?
    8 years ago by Mohak Sharma
    Ans 1 ->
    No it cant be.Potential drop across the mid cap is 50 v in each case.
    8 years ago by

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  66.  
    67. transfer of charge implies transfer of electrons then why the conductor supplying charge to another conductor is getting negatively charged?
    8 years ago by Aditi Gupta

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  67.  
    68. Transfer of charge implies transfer of electrons then why the conductor which is transferring charge to another conductor is getting negatively charged?
    8 years ago by Aditi Gupta

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  68.  
    69. sir should'nt field due to single plate Ex be just (sigma/E0) only for sheet it should be (sigma/E0) right?
    8 years ago by Vaishnavi Kulkarni

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  69.  
    70. http://physicsgalaxy.com/lectures/1/24/1075/Solved-Example-9#38
    8 years ago by rajat puri

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  70.  
    71. a capacitor of 1uf initially charged 10 v is connected across an ideal inductor of 0.1 mH. the maximum current in the circuit is?? a) 0.5 A b) 1 A c) 1.5 A d)2 A give resons too for the appropriate answer.
    8 years ago by naveen upadhyay

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  71.  
    72. what is the difference between cell(battery) and capacitor
    8 years ago by shwetamber pathak
    Ans 1 ->
    battery can maintain a constant pd whereas the pd of a capacitor depends upon charge, moreover capacitor can store charge but battery cant.
    8 years ago by Saurabh kumar nayak

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  72.  
    73. Sir while integration you took a binomial approximation but if we dont apply the appox then integral (1/ax+b)=(1/a)ln (ax+b)...So my question is that if such question appears in examination then how to proceed since there also a none of these option . Thanx
    8 years ago by Mohak Sharma

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  73.  
    74. Sir in the alternative method i have doubt in the step of isolating junction..what does it actually mean..how it is done..why after isolation both have 50 volt?___thanks for all help and video lectures
    8 years ago by Mohak Sharma
    Ans 1 ->
    Since the middle potential will always be 50 volt no matter what the arrangement of the lower figure.Since it is independent of lower structure the node can be isolated.
    8 years ago by

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  74.  
    75. Sir for calculating delta q why charge on 5 uF capacitor not taken
    8 years ago by Mohak Sharma

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  75.  
    76. where have you uploaded the topic of charging and discharging of a capacitor ......... please help me to find it out ......!!!!!!!!!!!!!!!
    9 years ago by rajat puri
    Ans 1 ->
    just go through the list of videos you'll find it
    8 years ago by ANURAG KAUSHIK

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  76.  
    77. Respected sir, I think we should double the value of electric field because due to contribution of both the plates of capacitors.(just like we done in wire capacitor)
    9 years ago by sudeep khare
    Ans 1 ->
    If we take electric field due to both plates then electric field due to individual plate will be sigma/2(epsiolon o) so the result will remain the same... In above case we are using the result of net electric field just outside a metal plate which includes all fields...
    9 years ago by Physics Galaxy

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  77.  
    78. Respected sir, in the capacitance why we take the value of electric field 2k*lambda/x? I think we should take electric field as 2*2k*lambda/x because due to both outer and inner cylinder the electric field gets doubled.
    9 years ago by sudeep khare
    Ans 1 ->
    Due to charge on outer cylinder there is no electric field inside it....you can see the respective module of electric field due to hollow cylinder to understand this...
    9 years ago by Physics Galaxy

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  78.  
    79. Is the capacitance of a conductor placed in vacuum is infinity?
    9 years ago by sudeep khare
    Ans 1 ->
    No. When a conductor is placed in vacuum the capacity to which it can be charged can be taken infinity if conductor metal strength is taken infinite... whereas the capacitance of body will be finite as it is the ratio of charge to potential difference of body wrt the reference... like a conducting sphere has capacitance 4(pi)(epsilon 0)R when placed in vacuum... but it can be charged to any extent depending upon its potential as in vacuum no breakdown takes place...
    9 years ago by Physics Galaxy
    Ans 2 ->
    no
    6 years ago by Aakhyat Singh

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  79.  
    80. Respected Sir, Please tell me that in the last step in order to calculate the time period,why don't we multiply it with 2 and instead you multiply by 4..I think it should be 2 because it will pass through the (l-x)region twice..please explain that why shoild we multiply it with 4?
    9 years ago by Vineet Chatterjee
    Ans 1 ->
    From one extreme we have calculated the time to fill the capacitor i.e. the time from extreme to mean position which is one quarter of the time period of whole motion when the slab reaches its initial position after one complete oscillation thats why we multiply it with 4...
    9 years ago by Physics Galaxy
    Ans 2 ->
    Thank you sir.
    9 years ago by Vineet Chatterjee
    Ans 3 ->
    thank you
    6 years ago by Nallam Suraj
    Ans 4 ->
    thank you
    5 years ago by

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  80.  
    81. what'll be the situation if only s2 is closed ?
    9 years ago by Anand Rahangdale
    Ans 1 ->
    bhai vgoltage nahi aata capacitor ke along samag gaye ta kuch bhi nahi hota
    5 years ago by kamal

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  81.  
    82. why common node will have common potential ? is there application of wheatstone network ?
    9 years ago by Anand Rahangdale

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  82.  
    83. What will happen if i place a resistor between the plates of a capacitor?
    9 years ago by parasuram
    Ans 1 ->
    inside a capacitor?? if yes, i beleive the charges will flow and it would act as a normal circuit.....bcoz if you connect there wont be any storage of charge
    9 years ago by suril

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  83.  
    84. Sir if the condition d>>r is not followed then how to find the capacitance.
    9 years ago by Akash Shah
    Ans 1 ->
    in that case, don't neglect r in ln((d-r)/r) ie) the answer will be c=pi*Eol/ln((d-r)/r) instead of the capacitance calculated by sir...
    9 years ago by Sabbarish Govindarajan

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  84.  
    85. please can you tell me sir, how did you write q1f+q2f/c1+c2 = g1/c1=q2/c2
    9 years ago by himanshu chhabra
    Ans 1 ->
    by conservation of charge
    9 years ago by sugam gandhi
    Ans 2 ->
    read about componendo and dividendo in algebra
    8 years ago by Ajay Sabarish

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