Question

9. Why is the electromagnet inside a doorbell magnetised and demagnetised alternatively?
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Answer 1

Answer:

Its because in electric bell when the circuit is closed and no current is passed, then the hammer will touch the soft iron. When current is passed through it, the electromagnet pulls the hammer to its side and hits the cong. ... The hammer goes back to its position and the curcuit is closed once again.

Hope this helps you mate!

Answer 2

Answer:

Its because in electric bell when the circuit is closed and no current is passed, then the hammer will touch the soft iron. When current is passed through it, the electromagnet pulls the hammer to its side and hits the cong. ... The hammer goes back to its position and the curcuit is closed once again.