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Magnetic moment of current loop integral

  1. Feb 5, 2015 #1
    The question states: The calculation of the magnetic moment of a current loop leads to the line integral
    ∮ r x dr
    I am puzzled - shouldn't this be ∮ r x dl where r is the radius of the loop and dl is the small change along the loop?
    (I think dr would be in the same direction as r, so no cross product for r and dr?)
  2. jcsd
  3. Feb 6, 2015 #2


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    Staff: Mentor

    That looks like a notation error. r x dl looks better.
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