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Question on Electromagnetism. Specifically to do with speed of an object in a field.

  1. Aug 24, 2012 #1
    1. The problem statement, all variables and given/known data

    Problem is http://imgur.com/bQIFJ

    2. Relevant equations

    I presume F=BIl and E=Blu.

    3. The attempt at a solution

    Not very well. I don't really understand how to start the question so if I could get some nudges in the right direction that'd be great. I'm not sure how the speed of the van comes into play here. I gather that I'll have to work out V once for the 38uT field density and then again for the 42uT and get the difference.
     
  2. jcsd
  3. Aug 24, 2012 #2
    Re: Question on Electromagnetism. Specifically to do with speed of an object in a fie

    You can find it using E= Bul
     
  4. Aug 24, 2012 #3

    Simon Bridge

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    Re: Question on Electromagnetism. Specifically to do with speed of an object in a fie

    This is an induction problem - the current induced is proportional to the change in magnetic induction (B) inside the coil.
    http://physics.bu.edu/~duffy/PY106/InducedEMF.html
     
  5. Aug 24, 2012 #4
    Re: Question on Electromagnetism. Specifically to do with speed of an object in a fie

    I don't think the question has enough information. A loop of wire will not produce any output voltage unless the field is varying. To calculate the output you need the rate at which the field is varying. Vehicle speed plus the two field strengths is not enough to establish the rate of change of the field.

    The equation you need is V = - N d(phi)/dt

    Do you have a picture/drawing of what this "detector" looks like?
     
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