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Why is the electromagnet inside a doorbell magnetised and demagnetised alternatively? Pls answer fast

When we press the doorbell switch the circuit complete then that became magnetised and then switch automatically off then the circuit opened nd electromagnet in doorbell demagnetised.
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it is because the person inside cannot understand if anyone is there if the doorbell keeps on ringing and it will be a trouble to the people inside the house as they cannot sleep peacefully if the door bell keeps on ringing.
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this is because if we press the doorbell so the circuit closes and the hammer beats the iron object because by electricity the iron object become magnet and hammer beats it so if electromagnet is not there so the bell will not ring.
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woking of a electromagnet is when we press the switch the electromagnet starts attracting the iron strip towards it the hammer attached to it hit  the gong and produces the sound but when we leave the switch the iron strip comes back to it original position and there is a gap produced between the iron strip and hammer and if we press the switch again whole process will start again.
 
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As Doorbell Run on AC volt so in half the cycle it get polarised in one direction and in another half cycle it get tend to polarise for another pole and it makes the demagnetise of the first half cycle created pole and this cause chattering and the bell make /produce sound
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It works for a while till the switch is turned off it is used to touch the metal strip and move the hammer to hit the gong
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Aiyoo
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Dear student,
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 curcuit is broken and the current can't complete a full circle. The hammer goes back to its position and the curcuit is closed once again. This process continues again and again.
Hope it helps you.
And Amal hi.
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