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A microphone is similar in set-up to the
speaker of Fig. 9.9, except that a current is not sent
through the wire loop. Instead, sound waves enter the microphone,
which cause the microphone to vibrate back and forth. This subsequently
causes the wire loops to oscillate, and the magnetic field through the
plane of the loops subsequently changes, inducing a current in the wires.
In this way sound or wave energy is converted into electrical energy.