The 10-turn loop of wire shown in the figurefigure 1lies in, Ask an Expert

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The 10-turn loop of wire shown in the figure(Figure 1)lies in a horizontal plane, parallel to a uniform horizontal magnetic field, and carries a 2.0 A current. The loop is free to rotate about a nonmagnetic axle through the center. A 50 g mass hangs from one edge of the loop.

What magnetic field strength will prevent the loop from rotating about the axle?

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