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

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  1.  
    2. Why are we taking the elements from 0 to R (please explain) [2:10]
    1 years ago by

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  2.  
    3. .
    1 years ago by Nihaal Tapasi

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  3.  
    4. sir , for very large resistance we will use integration or limits method to sove for final resistance how can we directly us this formula
    2 years ago by

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  4.  
    5. Another doubt, along the direction of current, potential decreases. so Va > Vb ..... and
    2 years ago by

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  5.  
    6. Two doubts :- 1. In first case there is no current flowing. So why are we taking potential difference at Va and Vb. I think potential should be zero. 2. I am confused... what is difference between Electromotive For (EMF) and potential difference
    2 years ago by

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  6.  
    7. sir n = I/E will be the formula for any time or only 1 sec
    2 years ago by

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  7.  
    8. sir solved problems such difficulties are there
    3 years ago by Tushar deepak Patil
    Ans 1 ->
    electric current mobility
    3 years ago by Tushar deepak Patil

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  8.  
    9. Sir it should be 2l when we differentiate the ares S.
    3 years ago by

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  9.  
    10. how can we say the force will act left ward
    3 years ago by GORLE KRISHNA CHAITANYA M1B

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  10.  
    11. sir how can you decide that the current direction is towards up
    3 years ago by GORLE KRISHNA CHAITANYA M1B

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  11.  
    12. very good teaching sir
    4 years ago by Mani Kiran

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  12.  
    13. sir superb explanation i hope i finish all your vidoe advanced illustraion beofre jee avdanced 2019..sir becoz of u now i could feel that i could crack jee avdance dphysics thank u so much sir.....will meet u soon
    5 years ago by Sarju Panchal

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  13.  
    14. Hi sir, Can we write these definitions and derivations in our board examinations? My school's book has different derivations so i am confused...What should i do?
    5 years ago by Aman Kumar

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  14.  
    15. Sir, what is the difference between an extraneous charge and bound charge? or is it same?
    5 years ago by Ayush Jaiswal

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  15.  
    16. Sir but our cell generally will be a galvanic cell (indirect redox) then how there will be internal resistance acting?
    5 years ago by Swapil Sharma

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  16.  
    17. I want to learn your all topics in Hindi
    5 years ago by Abhishek kumar

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  17.  
    18. I have doubt... there are conceptual lectures and advance lectures... then why pg classes and booster classes... which i follow... what is the order to watch videos
    5 years ago by Repudi Rajasekhar

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  18.  
    19. Post your query related to above video lecture
    5 years ago by Dharamjeet Singh

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  19.  
    20. EMF is the work done Per unit charge What will be the nature of the force responsible for this work done - conservative or nonconservative
    5 years ago by nikhil gupta

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  20.  
    21. EMF is the work done Per unit charge What will be the nature of the force responsible for this work done - conservative or nonconservative
    5 years ago by nikhil gupta

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  21.  
    22. How did u get the opposing force as kv,sir????
    5 years ago by Srija kande

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  22.  
    23. How did u get the opposing force as kv,sir????
    5 years ago by Srija kande

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  23.  
    24. sir what does k represent in kv.
    5 years ago by Vinayak Singh

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  24.  
    25. sir,for writing the answer of dq/dt=mcdT/dt ,is int it correct
    5 years ago by Divay Nagar

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  25.  
    26. Sir, plz post more related equivalent resistance in grid
    5 years ago by Venkataramana

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  26.  
    27. Why is the speed equal to (eE)/k?
    6 years ago by Santhosh Prabahar
    Ans 1 ->
    to make the acceleration 0 0
    5 years ago by Vinayak Singh

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  27.  
    28. sir we need the good concepts abt LR,RC&Lcr circuits both series¶llel combtn wen ac&dc sources r used...
    6 years ago by KARUNA SAGAR

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  28.  
    29. These questions sets dont work properly
    6 years ago by Gunjan Arya

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  29.  
    30. when the sell of difference emf and internal resistance are connected in parraler the current capicity decrease in comparisan with single sell how?
    6 years ago by narayan kalani

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  30.  
    31. sir why have you stopped live streaming,it was very useful as it covered all the basics as well as all the advance illustrations
    6 years ago by Sparsh agrawal

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  31.  
    32. A 2-V cell is connected to a 1-Ohm resistor. How many electrons come out of the negative terminal of the cell in 2 minute.
    6 years ago by Aviral Singh
    Ans 1 ->
    1.5*10^21 electrons apply the formula I=Q/T Q=ne where n is number of electrons and e is charge of an electron find I first by using V=IR T= 120seconds
    6 years ago by ABHISHEK SHANKAR

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  32.  
    33. Sir in this question i am not getting reason behind the answer Consider a current carrying wire (current I) in shape of circle. Note that as the current progress along the wire , the direction j(current density) changes in exact manner, while current I remain unaffected. The agent that is essentially responsible is :- (A) Source of EMF (B) Electric field produced by charge accumulated on the surface of wire (C) The charges just behind a given behind segment of wire which push them just right way by repulsion. (D) The charges ahead Ans.B
    6 years ago by Parth Dev Bundela

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  33.  
    34. cell is a source of constant emf but not constant current. why?
    6 years ago by ankit adarsh
    Ans 1 ->
    Actually cell provides power from the electrolyte in it as ions of this ion consumes more and more EMF remains same but no carrier for current
    6 years ago by Parth Dev Bundela
    Ans 2 ->
    no..it is not necessary that cell provide only condtant emf it also provide consant current actually the cell(galvanic cell) is designed to provide constant emf and the current keeps on varrying on the arrangement of resistors in the circuit
    6 years ago by ankit adarsh
    Ans 3 ->
    actually i meant for eveready cell
    6 years ago by Parth Dev Bundela

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  34.  
    35. Sir, if I use the reference temperature as 0 degree Celsius and use two equations to solve, I am getting 5040 degrees Celsius as the answer. If I use reference temperature 10 degrees celsius, I get 5030 degrees Celsius. This has happened in other similar problems as well. Is there anything wrong in using this technique?
    6 years ago by Kishore Sathia

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  35.  
    36. Why is the opposing force kv?
    6 years ago by Yukti Khosla
    Ans 1 ->
    this is because in fluid mech. we had studied that viscous force is proportional to v. and it used to change with magnitude of veloctity . and at further high speed it is proportional to v^(2) or v^(3)
    6 years ago by Parth Dev Bundela

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  36.  
    37. sir how those two 6 ohm resistors are in parallel connection?
    6 years ago by dinesh sai

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  37.  
    38. sir, how do the electrons move with constant velocity thereafter , if resistance is offered in their path by circuit ???
    6 years ago by Pratyush Ranjan Roul

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  38.  
    39. Sir is'nt the area vector and Jvect or making an angle of 90?
    7 years ago by shivanshu

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  39.  
    40. sir in the question 'x' is measured from the edge but you have taken a strip which is at a distance 'x' from the side.how's that possible sir!!!
    7 years ago by Sandeep Bolla
    Ans 1 ->
    edge of cross section is the side of cross section only... in question it is not specified that x is from the edge of the wire... you must read the question carefully first...
    7 years ago by Physics Galaxy

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  40.  
    41. Sir please tell me where to find the principle of superposition ?....asap its really urgent
    7 years ago by Shubhit Talus
    Ans 1 ->
    For this watch the fundamental class - 8 on ELECTRIC CIRCUITS on 23-Sep at 1:30pm or watch its recording after that...
    7 years ago by Physics Galaxy

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  41.  
    42. sir how this calculation has become 0.98d
    7 years ago by ariya
    Ans 1 ->
    1/(1.01)² = 1/(1 + 0.01)² = 1/(1+2 x 0.01) = (1+0.02)^(-1) = (1-0.02) = 0.98 -------- hope you get it...
    7 years ago by Physics Galaxy

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  42.  
    43. why should we consider the two dielcric capacitors in parallel?
    7 years ago by sesha sai

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  43.  
    44. One end 'A' of a wire AB is radiated with a (alpha) rays and other end 'B' with ß (beta) rays. Then: (A) current will flow from 'A' to 'B' (B) current will flow from 'B' to 'A' (C) current will flow from both ends towards Center (D) There will be no current in the wire Dear Ashish Arora Sir, Could you please tell me which option is correct and why?
    7 years ago by Deepu

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  44.  
    45. A voltmeter V of resistance 400 ohms is used to measure the potential difference across a 100 ohms resistor in the circuit shown here. (a) What will be the reading on thevoltmeter? (b) Calculate the potentiometer across 100 ohms resistor before the voltmeter is connected.
    8 years ago by aswin gawtham

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  45.  
    46. here there is a slight mistake note that Req is less than the least of R1 R2 and R3 this statement is wrong we can very easily prove by substituting R1=1 R2=2 R3=3 and we get Req= 1.833 thus we can prove that this statement is wrong everyone note this point
    8 years ago by akanksh
    Ans 1 ->
    U need to take the reciprocal. It is 1/Req
    8 years ago by Mohak Sharma

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  46.  
    47. sir in the final answer there is a calculation mistake taken place
    8 years ago by Niranjan Reddy
    Ans 1 ->
    answer is correct
    7 years ago by Rithik Chopra

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  47.  
    48. E=V/d. So,if the length of the conductor is very much,Electric field will tend to 0. So, drift velocity will also tend to 0. But in actual case,if a 1m long wire or a 1km long wire is used, same time is needed for the bulb to glow.Please explain.
    8 years ago by Shivam Agarwal

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  48.  
    49. Why there is accumulation of charges at the boundary even if same current is flowing in the two conductors
    8 years ago by AKASH GOYAL

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  49.  
    50. is motion of charges across a conductor momentum conserving
    8 years ago by tanu bansuri

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  50.  
    51. Sir i dont have any question as your way of teaching is just brilliant. But sir the videos that are shown now are ridiculous... like they are buffering continuosly...we are unable to see what you are writing because everything that u r speaking is being written in the screen at the bottom with a black background...i understand that they r helpful for some people...but because of it we r unable to see that what r u writing...the videos that were available previously were perfect... so sir i request u to remove these YouTube videos and restore the earlier ones...please sir..
    8 years ago by Aditya sharma
    Ans 1 ->
    You need to just turn the subtitles off.
    8 years ago by Shivansh Maheshwari
    Ans 2 ->
    there is a button called cc at the bottom. you just click on that... the subtitles will disappear
    7 years ago by Sandeep Bolla

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  51.  
    52. Two resistance when connected in series gives 40 ohm as net resistance, but when connected in parallel give 6.4 ohm as net resistance. Find the value of individual resistance.
    8 years ago by Kartikey Singh

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  52.  
    53. sir the answer is 13.6x10e5...
    8 years ago by Manik
    Ans 1 ->
    true
    8 years ago by Niranjan Reddy

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  53.  
    54. Something is not right with the final answer.
    8 years ago by Josh Pius
    Ans 1 ->
    true
    8 years ago by Niranjan Reddy

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  54.  
    55. Dear sir you had got drift velocity to be less than one ...but as soon as we close the switch electrons start flowing without taking a unit second but if it would with the speed less than 1 how we will get current as soon as we close the switch???
    8 years ago by Abinay gangireddygari
    Ans 1 ->
    It is only the drift velocity which is less but the electron density is very very high.due to this reason even the small velocity of electrons can cause large values of currents..
    8 years ago by L.m.rama krishna
    Ans 2 ->
    are yaar this is a famous question. let me take a example, there are thousands of soldiers arranged in a queue(electrons in a conductor), and there is a water bottle(bulb) just in front of the first soldier. the water empties(bulb glows) only when a soldier drinks it(electrons reach it). so when they are commanded to march(battery on), the first soldier(first eletron) would take no time to reach the bottle(bulb), hence water is emptied(bulb glows) no matter if the speed of the soldiers is 1 mm/s.
    8 years ago by Saurabh kumar nayak
    Ans 3 ->
    The best explanation could be like if the drift velocity has a magnitude in 10^-4 m/s, then how does a bulb glows almost instantly when the switch turns on. This is due to the fact that electrons are present in the whole wire,and also inside the bulb,where current has to be supplied. As soon as an electric field is set up,all the electrons move with a drift velocity.So,the bulb glows almost instantly.
    8 years ago by Shivam Agarwal

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  55.  
    56. hello sir its a general question .....that what do you mean by big bang theory????????? can you please explain me.......
    9 years ago by vanshika bhardwaj

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  56.  
    57. A spherical conductor, carrying a total chargeQ, spins uniformly and very rapidly about an axis coinciding with one of its diameters in clockwise direction.Then what will be its equilibrium charge density on its surface?Please give the figure in the answer.
    9 years ago by SATYABRATA SINGH
    Ans 1 ->
    For a given speed volume charge density of sphere changes to maintain an internal electric field which balances the centrifugal force on free electrons in the body...
    9 years ago by Physics Galaxy

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  57.  
    58. What will happen if i place a resistor between the plates of a capacitor?
    9 years ago by parasuram
    Ans 1 ->
    If battery is connected... current will flow through it and if battery is not there... capacitor will discharge...
    9 years ago by Physics Galaxy

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  58.  
    59. in the derivation for internal resistance,how is it IR=(lambda)*l2? there is no current flowing through the R is the secondary circuit right? pls explain
    10 years ago by arvind srinivas
    Ans 1 ->
    current due to ... secondary battery is flowing... into.. R, which causes a PDrop across it... and which is equal to.. to lambda*l2 bcz they both are in parallel...
    10 years ago by Ocean Balodiya

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  59.  
    60. pleas tell why...in the definition of potential diff. we hve to bring the chrge unaacelerated??i mean wat diffrence wud it make if the external agent accelerates the chrged particle in the prsence of an electric field..(consider that from infinity the ext agent has accelerated the particle such that net change in kinetic energy is zero i.e delta K.E. is zero b/w final point and infinty.......thnks alott in advanced...?
    10 years ago by overdozed
    Ans 1 ->
    If charge accelerates then the work done will also be consumed in imparting kinetic energy of the charge and the def states that work done per unit charge is the potential difference will not be valid...... Even if final KE is zero then it may be due to some other non conservative forces... so thats also not valid..
    9 years ago by Physics Galaxy

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  60.  
    61. sir please tell....if electrons are not continuously accelerated then how a current passing through the filament of the (dc)bulb is able to emit electromagnetic radiation(light)...which is not possible widout the acceleration of chrges(electrons) ???????
    10 years ago by overdozed
    Ans 1 ->
    electrons are accelerated due to force experienced by electric field ... but are also opposed due to collisions and also due to interaction with other neearby electrons ... while colliding they distribute some of their kinetic energy ... probably exciting an electron to some another energy level .... and hence light emitted is due to increase in energy of electrons of atoms of that conductor .... that is why you only observe excess energy on the form of light .. when collisions become significant enough like filamint in bulb.
    9 years ago by yashwanth

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  61.  
    62. sir ..i wanna know dt if.. charges(electrons) are not accelerated in a conductor(appliance..like bulb)..when a dc voltage is apllied across its ends then why is dat a bulb or LED generates electromagnetic radiations.(light)...vdout accelerating the charges ??????
    10 years ago by overdozed
    Ans 1 ->
    In LEDs and bulbs the electromagnetic radiations are produced from the jumping of electrons from a higher energy level to a lower energy level i.e. from conduction to valence band.
    10 years ago by Bhavya Popli
    Ans 2 ->
    in bulb joules law of heating is applied by which filament(tungsten resistivity=52.3 ohm m)gets heated up and simultaneously electrons get excited.when they fall back from higher energy level to lower energy level difference in energy is emitted as light.ACCORDING TO WWEIN'S DISPLACEMENT LAW WAVELENGTH INVERSELY PROPORTIONAL TO ABSOLUTE TEMPERATURE.AS WAVELENGTH INCREASES IT MOVES FROM INFRARED REGION TO VISIBLE REGION.
    9 years ago by REEMA S

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