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The loop of 1wire shown below has length = 12 cm and width = .5 cm. It lies in a horizontal plane. parallel to a uniform horizontal magnetic field. and carries a 2.5 A. direct current in a counterclockwise direction. The loop is free to rotate about a non-magnetic axle through the center. A ?5 g mass hangs from one edge of the loop. What magnetic field strength will prevent the loop from rotating about the axle