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Q.

Magnets that have temporary magnetism are called as?


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a

Electromagnets 

b

Bar magnets 

c

Circular magnets 

d

Horse-shoe magnets 

answer is A.

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Detailed Solution

Magnets that have temporary magnetism are called Electromagnets.
An electromagnet works on the principles of the magnetic effect of current. It usually consists of a wire wound into a coil. A current through the wire creates a magnetic field concentrated in a hole, denoting the centre of the coil. An electromagnet acts as a magnet when an electric current is passed through the insulated copper wire and loses its magnetism when the current is stopped. It contains a soft iron piece called the core with an insulated copper wire wound.
 
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