Assertion :A super conductor is a perfect diamagnetic substance. Reason: A super conductor is a perfect conductor.

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.
A superconductor does not allow magnetic field lines to pass through it. This effect is known as Meissner's effect. This happens because the induced currents set up inside the superconductor in response to the application of external magnetic field face zero resistance and the field produced by these induced currents exactly cancels the applied field.
Superconductors have zero resistance so they are perfect conductors.

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