In the figure below, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 8.50 cm. Each...

In the figure below, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 8.50 cm. Each wire carries 18.0 A, and all the currents are out of the page. In unit-vector notation, What is the net magnetic force per meter of wire length on wire 1?