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i dont understand that much but i think the magnet just makes the music louder.

Correction.

Well, if you don't understand, why say anything?


In a dynamic microphone, the diaphragm is vibrated by incoming sound waves.


The diaphragm carries a coil of wire in a magnetic field.


The motion of the wire coil in the magnetic field creates an electrical signal, a bit like a loudspeaker in reverse.


With no magnet, the dynamic microphoone would not work.



Be aware that "condenser" and "electret" microphones do not use magnets.

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