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Question

When we pass electricity through the coil, it produces magnetic field around the soft iron piece and this soft iron piece becomes electromagnet and its magnetic strength can be changed by changing the amount of current flowing the coil.
Electromagnets have various uses in the industry. It can be used to separate magnetic material from non-magnetic material as it will attract all the magnetic material, thus leaving behind all the non- magnetic material.
When we press the button for electric bell outside anyone's house, what happens? You hear a sound but that sound remains only till you press the button as soon as you remove your finger, the sound stops.

The mechanism which explains the bell out of the following is?


A

When you press the button, it opens the circuit and electricity flows through the iron piece and it becomes electromagnet and it attracts the striker towards it and in this process striker collides with bell, producing sound.

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B

When you press the button, it closes the circuit and electricity flows through the iron piece and it becomes electromagnet and it attracts the striker towards it and in this process striker collides with bell, producing sound.

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C

When you press the button, it simply strikes the bell and no electricity flows through it.

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D

Bell does not use any electricity or any electromagnet.

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Solution

The correct option is B

When you press the button, it closes the circuit and electricity flows through the iron piece and it becomes electromagnet and it attracts the striker towards it and in this process striker collides with bell, producing sound.


An electric bell contains an electromagnet, consisting of coils of insulated wire wound round iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clapper hits the bell and makes it ring.


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