How does the magnet in loud speaker work?
The permanent magnet in a loudspeaker is rigidly attached to the speaker frame. It “works” by providing a strong source of magnetic force that does not move. On the other hand, the electric current in the voice coil of the speaker produces a time-varying magnetic field that reacts against that of the permanent magnet to cause the voice coil to move, moving the speaker cone, moving the air, producing sound.
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