Four parallel long straight wires are carrying current perpendicular to the page

Question

Four parallel long straight wires are carrying current
perpendicular to the page, and the points at which they pass
through the page correspond to the corners of a square of side L.
As shown in the diagram two of the wires carry currents of 2I into
the page, while one of the other wires carries a current of 3I out of
the page. The fourth wire carries an unknown current.

What is the magnitude of the net force per unit length on the wire passing through
the upper left corner of the square, due to the other three wires? Express the magnitude in terms
of variables specified above as well as appropriate constants.

Explanation / Answer

i think the answer is 31 because if you lookat it as a square opposite sides are equal so if the first two corners are 21 and 31 im guessing the bottom will be the same

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