The 10-turn loop of wire shown in FIGURE P29.71 lies in a horizontal plane, parallel to a

Question:

The 10-turn loop of wire shown in FIGURE P29.71 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?

10 turns 5.0 cm 10.0 cm 50 g `Axle FIGURE P29.71