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Homework Help: Torque on a wire

  1. Nov 8, 2009 #1
    1. The problem statement, all variables and given/known data
    A wire is formed into a circle having a diameter of 10.0 cm and placed in a uniform magnetic field of 3.00 mT. The wire carries a current of 5.00 A. Find (a) the maximum torque on the wire (b) the range of potential energies of the wire field system for different orientations of the circle.

    2. Relevant equations

    T= mu x B

    3. The attempt at a solution

    For part a I did: T= mu x B= IA x B= I((2pi)(.5m)^2) x B
    = (5.00A)((2pi)(.5m)^2) x (3.00mT)

    is this right? if not what do I need to do?

    For part b: I have no idea and any help would be appreciated.
  2. jcsd
  3. Nov 8, 2009 #2


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    Homework Helper

    Check the area of the coil.
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