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Homework Help: Finding net torque on a loop

  1. Oct 13, 2013 #1
    1. The problem statement, all variables and given/known data
    http://ezto.mhecloud.mcgraw-hill.com/13252699450881445581.tp4?REQUEST=SHOWmedia&media=ch28q44a.jpg [Broken]
    A long, straight wire has a 11.1‐A current flowing in the positive x -direction, as shown in the figure. Close to the wire is a square loop of copper wire that carries a 1.65‐A current in the direction shown. The near side of the loop is d=50.7cm away from the wire. The length of each side of the square is a=1.31m .

    Question: Find the net torque on the loop.

    2. Relevant equations

    Torque = n*I*A*B*sin θ

    3. The attempt at a solution

    n, which is the number of windings is 1.
    A is the area that the loop encompasses.

    However, since there is a wire below the loop with current running through it, how do I account for that in the values of I and B and θ?
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 14, 2013 #2


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