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 ferromagnetic rod in a solenoid and passing current through it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The substances that can retain their magnetic properties at the room temperature for a longer time are termed as the permanent magnets.
The permanent magnets can be obtained by keeping the ferromagnetic rod in a solenoid and the magnetic field of the solenoid magnetizes the material.

Therefore, the assertion and reason both are correct but reason is not the correct explanation of the assertion.

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