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,χ−m=IH=−1
Therefore relative permeability
mur=1+χm=1−1=0.∴μ=μ0μr=zero.
i.e. for a perfectly diamagnetic material permeability is zero