Microphones are used to convert sound vibrations to electrical signals. In one kind of microphone, sound waves move a coil of wire up and down in a magnetic field, as shown in Figure P25.8. The coil shown has a diameter of 1.2 cm and has 100 turns; the 0.010 T magnetic field points radially out from the north pole to the south. If the microphone’s emf at some instant is 10 mV, what is the speed of the coil?

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S S N FIGURE P25.8 Wire coil