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Q.

In which of the following devices the magnetic effect of electric current is not used?

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a

An Electric bell

b

A crane to separate iron materials from junk

c

A heavy machine used to lift up a car

d

An electric iron

answer is D.

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Detailed Solution

  • When an electric current passes through a wire, it behaves like a magnet. This phenomenon is known as the magnetic effect of electric current.
  • Electric bells, machines and cranes used to lift or separate iron objects work on the principle of the magnetic effect of electric current.
  • Whereas, electric iron works on the heating effect of electric current.

Therefore, 'electric iron' is the correct response.

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