Assertion :A conductor can be used as dielectric. Reason: A conductor has infinite dielectric constant.

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
Explanation:
A conductor can be used as dielectric. The dielectric constant of a conductor (metal) is infinity in the sense that when a metal is placed in between two parallel plates in a capacitor. Hence, the derived dielectric constant (K) of the metal, is $\frac{E}{E r} = \frac{E}{0}$ which is infinity. This is why the dielectric constant is infinity.
Both assertion and reason are correct but reason is not explanation for assertion.
Hence option B is correct

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