When a small magnetising field \( \mathrm{H} \) is applied to a mag...

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When a small magnetising field \( \mathrm{H} \) is applied to a magnetic material, the intensity of magnetisation (I) is proportional to :
(A) \( \mathrm{H}^{-2} \)
(B) \( \mathrm{H}^{1 / 2} \)
(C) \( \mathrm{H} \)
(D) \( \mathrm{H}^{2} \)
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