Assertion :The ability of a material to permit the passage of magnetic lines of force through it is called magnetic permeability. Reason: For a perfect diamagnetic substance, permeability is always one.

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 C Assertion is correct but Reason is incorrect
For a perfectly diamagnetic substance,
$B = μ_{o} (H + I) = 0$ $∴ I = - H$ .
Therefore,
$χ_{m} = \frac{I}{H} = - a$
Therefore relative permeability
$μ_{r} = 1 + χ_{m} = 1 - 1 = 0$
$∴ μ = μ_{o} μ_{r} =$ zero
i.e. for a perfect diamagnetic material permeability is zero.

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