# A paramagnetic substance is kept in a weak magnetic field and its absolute temperature $T$ is increased. As a result, its magnetisation

$\begin {array} {1 1} (a)\;Increases\: in\: proportion\: to\: T \\ (b)\;Decreases\: in\: proportion\: to\: \large\frac{1}{T} \\ (c)\;Increases\: in\: proportion\: to\: T^2 \\ (d)\;Decreases\: in\: proportion\: to\: \large\frac{1}{T^2} \end {array}$

Magnetisation $I = \lambda\: H$
For a paramagnetic substance, $\lambda\: \alpha \: \large\frac{1}{T}$
$\therefore I \: \alpha \: \large\frac{ 1}{T}$
Ans : (b)