Question

The susceptibility and permeability of a perfectly diamagnetic substance is

• A. $1$ and $0$
• B. $0$ and $1$
• C. $-1$ and $0$
• D. $-1$ and $1$

Answer 1

Answer: (C)

$-1$ and $0$

For a perfectly diamagnetic substance
$B={\mu }_0(H+l)=0$
$\Rightarrow l=-H$
$\therefore {\chi }_m=\frac{l}{H}=-1$
and ${\mu }_r=1+{\chi }_m=1-1=0$
$\therefore \mu ={\mu }_0{\mu }_r=0$.