Electromagnets are used in

electric bells

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telephones

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dynamos

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all of the above

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Solution

The correct option is D
all of the above

An electromagnet is a magnet whose magnetic field is generated by an electric current.
Use of electromagnets - electric fan, electric doorbell, induction cooker, magnetic locks, telephone, dynamo, etc.
Therefore, all the given components are using electromagnets.
Hence, option D is correct.

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