What causes the poles of the electromagnet in an audio speaker to repeatedly switch directions?
a metal striker that pulls on the magnet
a diaphragm that vibrates around the magnet
a current that rapidly switches direction
a device that opens and closes a circuit

A current that rapidly switches direction causes the poles of the electromagnet in an audio speaker to repeatedly switch directions.

An electromagnet is a type of magnet in which an electric current produces the magnetic field. The magnetic field vanishes as soon as the current is turned off. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil.

C

a current that rapidly switches direction

Explanation:

C on Edge-

sorry, you didn't give me the proper question

explanation: