Question

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

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

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

$\chi =\frac{C}{T-T_c}$

Where,

$C=$ material-specific Curie constant

From the above equation, we can infer that $\chi$ 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 $T=T_c$

Hence, option $\left(C\right)$ is the correct answer.

Why this Question? Key point: The dependence of magnetic susceptibility with temperature for a ferromagnetic substance is given by, $\chi =\frac{C}{T-T_c}$ Where, $C=$ material specific Curie constant $\chi =$ magnetic susceptibility of the material $T_c=$ Curie's temperature(in Kelvin)