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Magnetic Field and range of potential energy

  1. Mar 16, 2010 #1
    1. The problem statement, all variables and given/known data
    A wire is formed into a circle having a radius of .02m and placed in a uniform magnetic field of 1*10^-4. A current of 5A passes through the wire. What is the range of potential energy the wire possess for different orientations?


    2. Relevant equations
    torque=BIA



    3. The attempt at a solution

    The answer is 2BIA. However, I am not sure how to relate torque to potential energy in this scenario.
     
  2. jcsd
  3. Mar 16, 2010 #2

    ideasrule

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    Homework Helper

    torque is actually equal to BIAsin(theta), where theta is the angle between the field and the area. Potential energy is just the integral of -Td(theta), so find the function for potential energy and go from there.
     
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