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Find magnetic field of infinitely closely spaced loop

  1. Mar 25, 2010 #1
    My lecturer ask us to think about this question.

    Those loop are very closely spaced, with current I going in anticlockwise direction. The stack of loop have a total length of d. What is the magnetic field, B at the point X?

    (I assume the X to be directly on top of the center of the loops.)

    The attempt at a solution:

    Help!! I don't even know where to start. I tried to used the Ampere's Law
    [tex]\oint{B \cdot dl}=\mu_0I_{enc}[/tex]
    But realised I ended up getting the results for a cylinder.
  2. jcsd
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