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Physics 12 Help- Electomagnetism and Torque

  1. Jan 15, 2012 #1
    1. The problem statement, all variables and given/known data
    If you were given this question: http://img40.imageshack.us/img40/975/picture7we.png [Broken]
    how would you go about solving it?

    2. Relevant equations
    I found a formula that makes this question seem a lot easier. Torque = NIAB. however, this formula is not on the formula sheet that is approved by the school so I am not supposed to know about it unless i figure out how to derive it. Does anyone know how this formula was derived?

    3. The attempt at a solution
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jan 15, 2012 #2


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    Science Advisor
    Homework Helper

    Try http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magmom.html
    Last edited by a moderator: May 5, 2017
  4. Jan 15, 2012 #3
    Hmmm. I've never actually heard of a magnetic dipole moment or its potential energy. Apparently this question is supposed to be solved using solely equilibrium equations and electromagnetism equations which don't already include torque.

    Thanks for trying to help though.
  5. Jan 16, 2012 #4


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    Gold Member

    Is Force = Current x Length x B-field on your approved formula sheet?

    Of course, you'll need to add the equation for torque to come up with the answer.
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