why is the electromagnet inside a doorbell magnetized and demagnetized alternatively

Dear Student

When we switch ON the doorbell, circuit is complete and it gets magnetized. When it is switched OFF, circuit gets demagnetized.
In the process magnetisation and demagnetisation, dipoles of the molecules of material do not acquire initial position. So, there is loss of energy in each case. 
Hope this information will clear your doubts about topic.

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