Match List-I with List-II regarding relative magnetic permeability ($\mu_r$) where $\varepsilon$ is

Question

Match List-I with List-II regarding relative magnetic permeability ($\mu_r$) where $\varepsilon$ is a small positive number.
$\begin{aligned} & 	ext{	extbf{List I}} & & 	ext{	extbf{List II}} \ 	ext{(A)} & 	ext{ Diamagnetic} & 	ext{(I)} & \ \mu_r = 1 \ 	ext{(B)} & 	ext{ Paramagnetic} & 	ext{(II)} & \ 0 \leq \mu_r < 1 \ 	ext{(C)} & 	ext{ Ferromagnetic} & 	ext{(III)} & \ \mu_r \gg 1 \ 	ext{(D)} & 	ext{ Non-magnetic} & 	ext{(IV)} & \ 1 < \mu_r < 1 + \varepsilon \end{aligned}$
Choose the correct answer from the options given below.

Professor PC Thomas Classes · Answer

(b) : For diamagnetic materials, the relative permeability is slightly less than 1 ($0 \leq \mu_r < 1$), so A $\rightarrow$ II. For paramagnetic materials, it is slightly greater than 1 ($1 < \mu_r < 1+\varepsilon$), so B $\rightarrow$ IV. For ferromagnetic materials, it is very large ($\mu_r \gg 1$), so C $\rightarrow$ III. For non-magnetic materials (like vacuum), $\mu_r = 1$, so D $\rightarrow$ I.