As shown in Figure VI.3, a square loop of wire, with a mass of \(200 \mathrm{~g}\), is free to pivot about a horizontal axis through one of its sides. A \(0.50 \mathrm{~T}\) horizontal magnetic field is directed as shown. What current \(I\) in the loop, and in what direction, is needed to hold the loop steady in a horizontal plane?

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Loop can pivot about this axis. B FIGURE VI.3 10 cm 10 cm