Question

Meters, such as those in analog fuel gauges on a car, are a common application of magnetic torque on a current-carrying what?

Answer 1

loop

Meters, such as those in analog fuel gauges on a car, are another common application of magnetic torque on a current-carrying loop. Figure 22.37 shows that a meter is very similar in construction to a motor. The meter in the figure has its magnets shaped to limit the effect of  by making B perpendicular to the loop over a large angular range. Thus the torque is proportional to I and not.