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Homework Help: Square Loop and Magnetic Forces

  1. Oct 15, 2007 #1
    I need to prove that the magnetic force done to a square loop with a current by an uniform magnetic field is zero. The exact problem is this:

    I'm pretty sure you can calculate the force on a wire segment with F=(current through wire)(length of wire)x(magnetic field). Can I apply that in this problem or would a different approach be more suitable? The problem also states that I need to calculate a torque, I honestly have no idea WHERE I can do that in this problem.
  2. jcsd
  3. Oct 15, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Yes, use that to calculate the force on each segment.

    Depending on the direction of the field, there may be a net torque on the loop.
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