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Homework Help: Magnetic vector potential

  1. Jul 17, 2009 #1
    1. The problem statement, all variables and given/known data

    A current loop (of circular shape) is located at the X-Y plane.
    What is the magnetic field on the Z axis? (Use the magnetic moment and magnetic potential)

    2. Relevant equations
    M=(Ia)/c [tex]\widehat{z}[/tex]



    3. The attempt at a solution

    I got that the magnetic potential's Z component is zero.
    The magnetic potential's angular component is: -(Iar)/cr^3
    The magnetic potential's radial component is: (Iar)/cr^3

    But when I take the curl of A I get: (Ia/cr^3) [tex]\widehat{z}[/tex] , which is obviously not true.
    I've gone over the calculations a few times, maybe there's something I'm missing.

    Thanks in advance !
  2. jcsd
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