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Question

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

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
For a perfectly diamagnetic substance,
B=μ0(H+I)=0 I=H.
Therefore,χm=IH=1
Therefore relative permeability
mur=1+χm=11=0. μ=μ0μr=zero.
i.e. for a perfectly diamagnetic material permeability is zero

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