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A loudspeaker is a transducer that takes electrical signals and turns them into sound.
It has a large cone (diaphragm) that vibrates to form the sound.
The alternating electric current in the coil of wire generates its own magnetic field. The coil's magnetic field reacts to the magnetic field of the magnet and so the coil moves back and forth. This is called the Motor Effect.
The moving coil makes the cone move.
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