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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Magnetism and Matter
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A paramagnetic substance is kept in a weak magnetic field and its absolute temperature $T$ is increased. As a result, its magnetisation

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


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Magnetisation $I = \lambda\: H$
For a paramagnetic substance, $ \lambda\: \alpha \: \large\frac{1}{T}$
$ \therefore I \: \alpha \: \large\frac{ 1}{T}$
Ans : (b)
answered Feb 21, 2014 by thanvigandhi_1

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