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In the figure, four long straight wires are perpendicular to the page, and their cross sections...

In the figure, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 18 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 28 A. What is the magnitude of the net magnetic field at the square's center?

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