Electromagnetic induction is not used in

Transformer

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Room heater

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AC generator

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Choke coil

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Solution

The correct option is B Room heater
Room heater works on the principle of Joule's heating effect of current that heat is produced in the conductor (or resistor) on passing an electric current through it for some time.
While transformer, AC generator, and choke coil work on the principle of Electromagnetic induction.

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Explain with a neat diagram the coil-coil experiment demonstrating electromagnetic induction.

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