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Question

The variation of magnetic susceptibility χ with absolute temperature T, for a ferromagnetic material, is best shown by which of the following graphs?

A
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B
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C
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D
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Solution

The correct option is B
The dependence of magnetic susceptibility with temperature for a ferromagnetic substance is given by,

χ=CTTc

Where,

C= material-specific Curie constant

From the above equation, we can infer that χ is inversely proportional to the absolute temperature.

So, as temperature increases, magnetic susceptibility decreases.

The relation is not linear, rather it is rectrangular hyperbola-like relation.

Moreover, the law also predicts a singularity in the susceptibility at T=Tc

Hence, option (C) is the correct answer.
Why this Question?
Key point: The dependence of magnetic susceptibility with temperature for a ferromagnetic substance is given by,

χ=CTTc

Where,
C= material specific Curie constant
χ= magnetic susceptibility of the material
Tc= Curie's temperature(in Kelvin)

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