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Q.
The correct $M-H$ curve for a paramagnetic material at a constant temperature $(T)$ is represented by
Magnetism and Matter
Solution:
Since intensity of magnetisation $(M)$ of a paramagnetic material is given by
$M = C \frac{B}{T} = C\mu_{0} \frac{H}{T}$ as $\frac{C\mu_{0}}{T}$
is constant.
Then $M \propto H$
Hence, the $M-H$ curve will be a straight line with the
slope $C\mu _{0} \frac{1}{T}$.