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Q.

Which one of the following concept(s) is/are used in electrical bells?

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a

Bar magnetism

b

Self-orientation of magnet

c

Both of the above

d

Electromagnetism

answer is D.

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Detailed Solution

Electromagnetism is used in electrical bells.
An electromagnet is used in the electric bells. In the circuit of electric bells, there is an arrangement of creating the frequent electromagnetic effect in the electromagnet. When current flows, an electromagnet effect is generated, which makes a small metallic needle hit the bell, and it produces sound. This process is done at a very high frequency. An electromagnet is a device that acts as a magnet when an electric current is passed through it.
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