Guts:


A charge is kept coaxial with a thin ring, which is made of material with resistance 1 ohm/m. Then it is allowed to fall, under the force of gravity.

In the process that follows, what is the maximum value of current that flows through the ring?

Submit the value of this current, correct upto 3 places of decimal.


From now on:
If you get A/C, do not write your answer as a comment.

12 comments:

  1. AnujJanuary 7, 2011 at 6:37 PM

    A/C means accepted..

    ReplyDelete
  2. vmcianJanuary 7, 2011 at 9:34 PM

    please confirm if the method is correct. First find the flux as a function of distance from the center. then write alpha in terms of that distance.(done in frustum ques). Now find d(distance)/dt=velocity after derivating i.e to get emf. Now do by differntiation to maximise it. Please tell if I am correct. Coz I think values will be getting complicatd as epsilon is involved.
    THANX!

    ReplyDelete
  3. vmcianJanuary 7, 2011 at 11:02 PM

    please tell!

    ReplyDelete
  4. Sambhav GuptaJanuary 8, 2011 at 1:05 AM

    flux shud be magnetic to find emf induced
    the flux u found is electric flux

    ReplyDelete
  5. vmcianJanuary 8, 2011 at 10:21 PM

    so, then how will we have to solve it. Please explain!

    ReplyDelete
  6. vmcianJanuary 9, 2011 at 3:28 PM

    ok got it, bekar mein complicated soch raha tha.

    ReplyDelete
  7. AnujJanuary 10, 2011 at 1:59 PM

    so, did someone get the answer?

    ReplyDelete
  8. AmitJanuary 10, 2011 at 5:08 PM

    bhaiya, I got it

    ReplyDelete
  9. vmcianJanuary 10, 2011 at 5:27 PM

    yup me 2. Really complicated, things are always simple.

    ReplyDelete
  10. Pratik JainJanuary 10, 2011 at 8:12 PM

    yeah....really requires guts to answer.....

    ReplyDelete
  11. ShivankerJanuary 10, 2011 at 8:42 PM

    cudn't get it at d first go though.. :D

    ReplyDelete
  12. Sambhav GuptaJanuary 10, 2011 at 9:03 PM

    got it at the first go :P

    ReplyDelete

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