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Loudspeaker.
The loudspeaker uses a coil
which can slide backwards and
forwards over the central pole
of a circular permanent magnet.
The coil is joined by the brown bars
to a paper cone, shown
below.
The wire from the amplifier carries an alternating
current
which makes the coil (and the
paper cone) move backwards and
forwards
at the same frequency as the changing
current.
The paper cone then moves the air
backwards and forwards
which creates the sound.
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Copyright © 2008 Dr. Colin France. All Rights Reserved.
