Q. The relative permeability of a substance $X$ is slightly less than unity and that of substance $Y$ is slightly more than unity, then
A) $X$ is paramagnetic and $Y$ is ferromagnetic
B) $X$ is diamagnetic and $Y$ is ferromagnetic
C) $X\ and\ Y$ both are paramagnetic
D) $X$ is diamagnetic and $Y$ is paramagnetic
Explanation
(d) As $\mu_{r} < 1$ for substance $X$, it must be diamagnetic. And $\mu_{r} > 1$for substance $Y$, is must be para-magnetic.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.