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Ampere's Law trouble

  1. Jun 25, 2011 #1

    Where is my mistake? I have a feeling it's in the calculation of B... ?
    Last edited: Jun 25, 2011
  2. jcsd
  3. Jun 25, 2011 #2


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    Do you mean that B is constant inside the rectangle?

  4. Jun 25, 2011 #3
    It's a given that the rectangle is fixed to the ground..

    So apart from the fact that the magnetic field in it changes direction all the time, B's size is constant
  5. Jun 25, 2011 #4


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    So you say that the magnetic field of a current carrying wire does not depend on the distance from the wire?

  6. Jun 25, 2011 #5
    For a long straight wire, B is proportional to 1/r.
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