Assertion :When the radius of a copper wire is doubled, its specific resistance is increased. Reason: Specific resistance is independent of cross-section of material used.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Specific resistance is independent of the dimensions of wire. It is the property of the material of the wire.

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