Question: How do I account for the wire below the loop when finding net torque?

[nuagerose]

Homework Statement

http://ezto.mhecloud.mcgraw-hill.com/13252699450881445581.tp4?REQUEST=SHOWmedia&media=ch28q44a.jpg
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.

Homework Equations

Torque = n*I*A*B*sin θ

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?

 

[CWatters]

It's been awhile since I did this but.. Look up the field B generated by a current carrying wire. The field B depends on the distance from the wire, the current etc...

http://www.pa.msu.edu/courses/1997spring/phy232/lectures/ampereslaw/wire.html