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Homework Help: Problem on finding maximum torque on a simple loop

  1. Oct 8, 2004 #1
    The plane of a rectangular loop of wire with a width of W and a height of L is parallel to a magnetic field of magnitude B. The loop carries a current of I .

    What is the maximum torque that can be obtained with the same total length of wire carrying the same current in this magnetic field?

    *note i feel like ive tried everything and i can't seem to figure this problem out.
  2. jcsd
  3. Oct 8, 2004 #2
    i know you have to do something with optimizing the area

    i got this answer:


    but the website system says my answer is off by a multiplicative factor.
  4. Oct 9, 2004 #3


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    I think you would maximize the area by bending the wire into a circular shape.
  5. Oct 9, 2004 #4
    how did you get that answer patlai?
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