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The precise
timing of motors like this one makes them useful in clocks, timers
and recording equipment. This particular motor was originally used
to pump water in an aquarium. The wheel of this motor is turned
by a changing magnetic field. The coil of wire at the base of this
motor carries ordinary household electricity, creating a magnetic
field that changes direction 60 times every second. The wheel responds
to this magnetic field, but not immediately. The sluggish response
(called
hysteresis
) keeps the magnetism of the wheel slightly
out of step with the electromagnet.
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