Figure 2 shows views of the loop from above. Those vertical forces are equal in magnitude and opposite in direction, so that they also produce no net force on the loop. First, we note that the forces on the top and bottom segments are vertical and, therefore, parallel to the shaft, producing no torque. (This will lead to a useful equation for the torque on the loop.) We take the magnetic field to be uniform over the rectangular loop, which has width ww and height ll. Let us examine the force on each segment of the loop in Figure 1 to find the torques produced about the axis of the vertical shaft. A current-carrying loop of wire attached to a vertically rotating shaft feels magnetic forces that produce a clockwise torque as viewed from above. Electrical energy is converted to mechanical work in the process. When current is passed through the loops, the magnetic field exerts torque on the loops, which rotates a shaft. Motors have loops of wire in a magnetic field. Motors are the most common application of magnetic force on current-carrying wires. Calculate the torque on a current-carrying loop in a magnetic field.Describe how motors and meters work in terms of torque on a current loop.
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