Measuring the motion of flying insects Studying the motion of flying animals, partic...

Measuring the motion of flying insects Studying the motion of flying animals, particularly small insects, is difficult. One method researchers use involves attaching a tiny coil with miniature electronics to the neck of an insect and another coil to its thorax (Figure 18.21). They place the insect in a strong magnetic field and observe the changing orientations and induced emfs of the two coils in the field as the insect flies. Suppose that a 50-turn coil of radius 2.0 * 10-3 m is attached to a tsetse fly that is flying in a 4.0 x 10^-3-T magnetic field. The tsetse fly makes a 90° turn in 0.020 s. Consider the average magnitude of the induced emf that occurs due to the turn of the tsetse fly and its coil.

Which answer is closest to the magnitude of the flux change?