
Concept explainers
BIO Magnetic induction tomography (MIT) Magnetic induction tomography is an imaging method used in mineral, natural gas, oil, and groundwater exploration, as an archaeological tool; and for medical imaging MIT has also been used to measure topsoil depth in agricultural soils. Topsoil depth is information that many farmers need for instance, corn yield is much higher in soil that has a deep topsoil layer above the underlying, impermeable claypan. Using a trailer attached to a tractor, a farmer can map an
(about 20-acre) field for topsoil depth in about 1 hour.
Figure 21.28 shows how MIT works A time-varying
BIO 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 21.29 ). 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
-T magnetic field. The tsetse fly makes a
Which of the following could double the emf produced when the fly turns
a. Double the number of turns in the coil.
b. Double the coil’s area.
c. Double the magnitude of the external magnetic field.
d. Get the tsetse fly to take twice as long to turn.
e. a, b, and c

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Chapter 21 Solutions
College Physics
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