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Q.

The variation of magnetic susceptibility χ with absolute temperature T for a ferromagnetic material is

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a

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b

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c

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d

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answer is A.

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Detailed Solution

Susceptibility of a ferromagnetic substance falls with rise of temperarure χ=cT-Tc and the substance  becomes paramagnetic above Curie’s temperature, so magnetic susceptibility becomes very small above Curie's temperature.

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The variation of magnetic susceptibility χ with absolute temperature T for a ferromagnetic material is