Question

how the sound comes in to the magnet

Answer 1

hey hello.......

here it is.....Magnets can be used to attract or repel each other. Electromagnets can be switched between the two extremes, or made to slide gradually between the two. If you attach a cardboard sheet to one of them, it can be used to push and pull the air as it is attracted or repelled. Do this fast enough and this will be perceived by the human ear as sound.

hope this helps....