Assertion: Substances which at room temp...

Assertion: Substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets.
Reason: permanent magnet can be made by placing a ferramagnetic rod in a solenoid and passing current through it.

A

permanent magnets

B

electromagnets

C

ferromagnets

D

paramagnets

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The correct Answer is:

A

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