Question

What happens when the temperature of paramagnetic sample is lowered ? Hence define Curie's law.

Answer 1

In a paramagnetic material, the magnetization of the material is directly proportional to the applied magnetic field. However, if the temperature of the material is lowered, this proportionality is increased, for a fixed value of the field, the magnetization is inversely proportional to temperature.

Curie's law:- $M=C.\frac{B}{T}$

where, $T=$ absolute temperature

$C=$ curie constant

$B=$ applied magnetic field

$M=$ magnetization

$M\propto \frac{1}{T}$

This is called curie's law.