● For writing relationship between susceptibility and temperature
● Calculating the temperature
${\mathit{\chi }}_{\mathit{m}}\propto \frac{1}{\mathit{T}}$
${\mathit{T}}_2=\frac{{\mathit{\chi }}_{\mathit{m}1}}{{\mathit{\chi }}_{\mathit{m}2}}\times {\mathit{T}}_1$
${\mathit{T}}_2=\frac{1.2\times {10}^5}{1.44\times {10}^5}\times 300=250\mathrm{K}$
OR
● For identification of magnetic material
It is diamagnetic material.