Help with electricity, four wires that carry current

1. The problem statement, all variables and given/known data
So four wires are arranged in a square and all carry the same current "I"
They are all the same distance apart. The two on the left are coming out towards you "O" and the two on the right go away from you "X"

I knew I would need k[itex]I^{2}[/itex] divided by distance, but I"m not sure how to find the force, per unit length on the lower left wire. I have to find the magnitude and direction.

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