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In Fig. 29-41 four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a=13.5 cm. Each wire carries 7.50 A, and the currents are out of the page in wires 1,3, and 4 and into the page in wire 2. In unit - vector notation, what is the net magnetic force per meter of wire length on wire 4 ? |
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