Question: In Figure four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 20 cm.

In Figure four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 20 cm. The currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3, and each wire carries 20 A. In unit-vector notation, what is the net magnetic field at the square's center?

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