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Question

Choose the device that works on the principle of magnetic effects of electric current.

A
Iron box
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B
Wind turbine
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C
Loudspeakers
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D
Lever
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Solution

The correct option is C Loudspeakers
Loudspeakers contain speakers in it. Speaker is a device that has a diaphragm which produces sound on vibration. This vibration is provided by an electromagnet in the speaker.

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