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How is a electromagnet used to make a doorbell

As soon as the electromagnet gets activated it would pull the hammer towards the metal to produce the sound and at the same time the electrical circuit will be broken and so the electromagnet would stop attracting the hammer and so hammer goes back and again the circuit is completed. So the cycle starts newly. Thus the electromagnet switches off and switches on the circuit successively and also makes the hammer to hit the bell.
The pushing of the doorbell closes an electric circuit. Then electric current flows through an electromagnet, and the doorbell rings.

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