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

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  1.  
    2. how will we determine the B (vector) direction in this case?
    1 years ago by SARA IQBAL AHMAD

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  2.  
    3. why is torque T (due to weight of mass M) = mg*l?
    1 years ago by SARA IQBAL AHMAD

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  3.  
    4. Sir I had a doudt- how come you had taken the integral limits for dfx from 0 to 0?
    2 years ago by Thejas

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  4.  
    5. The explanation was awesome!
    2 years ago by Ridhiman Bhardwaj

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  5.  
    6. sir how torque weight of M =Mgl2
    3 years ago by SHAIK IMRAN

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  6.  
    7. sir how the direction of fm is right ?
    3 years ago by SHAIK IMRAN

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  7.  
    8. Sir where sre solution for quset
    3 years ago by Uday Kumar

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  8.  
    9. Why is tan theta equal to theta squared? Shouldn't it be simply theta.?
    3 years ago by

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  9.  
    10. Why are u writing n 1 sir?
    5 years ago by Rohit singh

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  10.  
    11. Can't understand this question
    5 years ago by Amit Kumar singh

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  11.  
    12. there is no clarity in videos view
    5 years ago by Pogula Venkateswarlu

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  12.  
    13. I can't find booster classes on physics galaxy site and on web , where are those videos sir ?
    5 years ago by Somesh raj

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  13.  
    14. I don't get how the angle @6:10 is 2theta
    5 years ago by Madhav Sharma

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  14.  
    15. Sir Will external electric field apply any force on the current carrying wire?
    5 years ago by Denis

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  15.  
    16. Do i need to solve HCV for better concept building?
    5 years ago by Aryan Sawhney

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  16.  
    17. sir lorentry force application konse module me he
    6 years ago by narayan kalani
    Ans 1 ->
    you just need to know the formula F= q(V x B) so if a charge q is moving along x axis and magnetic field is along y axis it will experience a force F along z axis using right hand thumb rule. the magnitude of the force F will be qVB as angle between V and B is 90 degrees and sin 90 is 1
    6 years ago by ABHISHEK SHANKAR
    Ans 2 ->
    the only application of lorentz force is a cyclotron.. a cyclotron accelerates a positively charged particle to very high energy levels....using lorentz force.. you can read up about it. it is important from cbse board exam point of view....
    6 years ago by ABHISHEK SHANKAR

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  17.  
    18. Sir is this wire a infinite one
    6 years ago by Anshuman

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  18.  
    19. Force should be along right
    6 years ago by Yukti Khosla
    Ans 1 ->
    By right hand ?? palm rule it will be towards left.
    6 years ago by Anshuman

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  19.  
    20. sir, My question is the particle moves along the direction of force vector as shown in module-3(direction of magnetic force on a moving charge) there is a displacement of particle so there should be workdone by particle
    7 years ago by
    Ans 1 ->
    particle is not moving along direction force vector...particle is moving along the direction of velocity vector... furthermore of a particle travels a distance dx in the magnetic field according to module 3 then F is perpendicular to dx so f.dx will be 0. hence we can conclude that force due to magnetic field on charge q only changes the direction of the charge and does not do any work on the charge, and velocity remains constant in a uniform magnetic field
    6 years ago by ABHISHEK SHANKAR

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  20.  
    21. Sir i tried with the integration method dq=(Q/4/3piR^3)x4pix^2dx = 3Qx^2dx/R^3 sir this extra factor of 3 is not getting cancelled out in the remaining method what am i doing wrong?
    7 years ago by Vishesh Jain

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  21.  
    22. Sir when we rotate the loop by an angle theta the sides AB and CD also make angle theta with the field. then there will be some force acting on them as well. Would you explain as to what happens there? i am stuck with that part. and can we use right hand palm rule as the angle between field and current should be 90 which is not. so how do we calculate the force there? do we take the sine n cos components of those sides?
    7 years ago by Shrutika Mhamunkar
    Ans 1 ->
    You don't need to take any components for it... as these are in opposite direction and get cancelled... so no need worry about this part...
    7 years ago by Physics Galaxy

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  22.  
    23. sir i am not clear about the pitch calculation of different B values.why we are increasing n value by 1
    7 years ago by ariya
    Ans 1 ->
    After every pitch particle reaches the line parallel to axis... so if B1 and B2 are two successive values then n has to increase or decrease by 1...
    7 years ago by Physics Galaxy

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  23.  
    24. Sir why do we need to integrate here
    7 years ago by Kunal Mohapatra
    Ans 1 ->
    as the magnetic induction is varying in the plane of loop, total flux can be calculated by integration...
    7 years ago by Physics Galaxy

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  24.  
    25. Sir but we know from electrostats that electric field is due to charges at rest so how can we consider force due it when charge is moving
    7 years ago by Siddhant Mahapatra
    Ans 1 ->
    that is specific case in accordance to chapter.
    7 years ago by sachin.s

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  25.  
    26. How is 2Tcostheta = lambda*g ??? forces are balanced wrongly. The tension in string is supporting the whole wire and not just a point.
    8 years ago by Rajat Bhadoria
    Ans 1 ->
    It does not make any difference when we solve the problem as units gets cancelled out in analysis... it is not affecting the final result... If you wish to explain it theoretically then yes you are right...
    8 years ago by Physics Galaxy

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  26.  
    27. sir the direction mentioned that is inwards is correct or not or the direction of applied shoud be reversed that is from right to left deflection to be inwards . hope u will clarify this doubt .
    8 years ago by rajat puri
    Ans 1 ->
    no brother if u use right hand palm rule as sir explained us in module 15 then palm face is in inward direction and hence force on wire is inward to the plane of screen.
    8 years ago by harshvardhan shukla

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  27.  
    28. resp. sir for higher value of 'B' how can we say that exactly 1 pitch will increase why not more than 1 ??
    8 years ago by vishal
    Ans 1 ->
    sir i too want to ask u the same question..
    8 years ago by Khushboo Jain

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  28.  
    29. sir should there be 1.6*10 to power -19 in denominator?
    8 years ago by vishal

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  29.  
    30. sir please just verify the magnetic force starts acting on stiff wire in outward direction from viewer side .
    8 years ago by sesha sai
    Ans 1 ->
    i do have the same doubt .if u are cleared then do post the answer
    8 years ago by rajat puri

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  30.  
    31. sir can you please explain how two different magnetic fields (B1 & B2) exist in same solenoid?
    8 years ago by sesha sai
    Ans 1 ->
    resp. sir for higher value of 'B' how can we say that exactly 1 pitch will increase why not more than 1
    8 years ago by vishal
    Ans 2 ->
    sorry i post at wrong place
    8 years ago by vishal

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  31.  
    32. Sir the modules are not arranged properly.Sir please see to it.
    8 years ago by Abhisek Sahoo

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  32.  
    33. sir thanks for great videos :) I think there is a calculation mistake in the end of the video ie ln(a)-ln(b)=ln(a/b) and u wote ln(ab) :)
    9 years ago by SOURAV

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  33.  
    34. Respected sir, I want to ask a question related to thomson's experiment. According to RHPR the force due to Magnetic field on electron must be opposite. Velocity is in Currents direction. As we are dealing with electron beam we must consider the opposite direction of velocity.
    9 years ago by sudeep khare

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  34.  
    35. why we take negative in W=-I*deltaphi?
    9 years ago by sudeep khare
    Ans 1 ->
    As external work = final potential energy - initial potential energy
    9 years ago by Physics Galaxy

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  35.  
    36. how to know the magnetic field at the center of a long spiral of n turns which has inner radius a and outer radius b lying in x-y plane
    9 years ago by sneha singh
    Ans 1 ->
    Pl see advance illustrations of Magnetic effects.. similar case is explained...
    9 years ago by Physics Galaxy

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  36.  
    37. why is magnetic induction at a point outside a infinite solenoid zero?
    9 years ago by Ayush Jain
    Ans 1 ->
    you may analyse it via Right hand Thumb rule.. no magnetic field line ;ll be outside !
    9 years ago by Anand Rahangdale

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  37.  
    38. sir,is there anything regarding magnetic torque,potential energy,cyclotron in video lectures .I have searched but i couldnot find it??
    9 years ago by MOTURU DIWAKAR
    Ans 1 ->
    Magnetic torque and interaction energy is there.. you can find it in magnetic effects of current but cyclotron is not there... will include it soon...
    9 years ago by Physics Galaxy

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  38.  
    39. Sir there were some questions on this topic which I had to ask from HC Verma. A circular wire loop of radius a, carrying a current i, placed in a is placed in a perpendicular magnetic field B. Consider a small part dl of the wire. 1. Find the force on this part of the wire exerted by the magnetic field. 2. Find the force of compression in the wire. 3. Find the increase in the radius of the loop if the magnetic field is switched off and the Young's modulus of the material of the wire is Y. Sir please explain the method of getting the answer also.
    10 years ago by Bhavya Popli
    Ans 1 ->
    plz will u tell me the que no and page, i do wanna' try !
    9 years ago by Anand Rahangdale
    Ans 2 ->
    sir please give answer of this to me also
    9 years ago by rajat gupta

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