Assertion (A): For a magnetic material M = (?r - 1) H, where M is magnetic dipol

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Question
Assertion (A): For a magnetic material M = (?_r - 1) H, where M is magnetic dipole moment/m³, H is field intensity A/m and ?_r is relative permeability.
Reason (R): ?_r can have any value from 0 to hundreds of thousands.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Correct Answer

A is true but R is false

Explanation

?_r is always more than 1. It cannot be 0 or less than 1.

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