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If $\chi$ stands for the magnetic susceptibility of a substance, $\mu$ for its magnetic permeability and $\mu_{0}$ for the permeability of free space, then
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Verified Answer
The correct answers are:
for a paramagnetic substance: $\chi>0$, $\mu>\mu_{0}$, for a ferromagnetic substance: $\chi>1$, $\mu>\mu_{0}$
We know that magnetic susceptibility
$\chi=\mu_{r}-1$
and \mu_r=\frac{\mu}{\mu_{0}}$
=Relative permeability
For paramagnetic substance,
$\begin{array}{ll}
& \chi>0 \\
\therefore & \mu_{r}>1 \\
\therefore \mu>\mu_{0}
\end{array}$
For diamagnetic substance,
$\chi< 0$
$\therefore \mu_r < 1$
$\therefore \mu < \mu_{0}$
For ferromagnetic substance,
$\begin{array}{l}
\chi>>1 \\
\mu>>M_{0}
\end{array}$
If
$0 < \mu < \mu_{0}$
Then substance will not be paramagnetic. Hence option (a) is incorrect and option (b) and (d) are correct.
$\chi=\mu_{r}-1$
and \mu_r=\frac{\mu}{\mu_{0}}$
=Relative permeability
For paramagnetic substance,
$\begin{array}{ll}
& \chi>0 \\
\therefore & \mu_{r}>1 \\
\therefore \mu>\mu_{0}
\end{array}$
For diamagnetic substance,
$\chi< 0$
$\therefore \mu_r < 1$
$\therefore \mu < \mu_{0}$
For ferromagnetic substance,
$\begin{array}{l}
\chi>>1 \\
\mu>>M_{0}
\end{array}$
If
$0 < \mu < \mu_{0}$
Then substance will not be paramagnetic. Hence option (a) is incorrect and option (b) and (d) are correct.
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