Magnetic Field and Parallel Wires

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I have four parallel wires carrying equal currents of 2 amps arranged in a square (see picture attachment for clarification) The figure is an end-view of the wires and each side of the square has an equal length of 0.1m. The direction of current is -Z for A, B, and C; and the direction of current is + Z for D.

How can I determine the magnitude of the magnetic field at point P in the center of the square?

I have the equation F=I'L x B, but I'm not sure how to solve this. Any pointers would be appreciated. Thanks!

Homework Statement





Homework Equations





The Attempt at a Solution

 

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