Stuck on a single homework problem. A drawing shows an end on VO three wires. Th
Stuck on a single homework problem. A drawing shows an end on VO three wires. They are long straight and perpendicular to the plane of the paper. They cross-sections lie at the corners of a square the current wires, one and two are I 1＝ I 2＝ I and directed into the paper what is the direction of the current in the wire three and what is the ratio I3/I1 so that the net magnetic field at the empty quarter is zero?
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