• # question_answer At a temperature of ${{30}^{o}}C$, the susceptibility of a ferromagnetic material is found to be $\chi$ . Its susceptibility at ${{333}^{o}}C$ is : A)  $\chi$                                     B)  $0.5\chi$ C)  $2\chi$                                   D)  $0.09\,\chi$

$\chi \,\propto \,\frac{1}{T}$ $\frac{{{\chi }_{2}}}{{{\chi }_{1}}}\,=\frac{{{T}_{1}}}{{{T}_{2}}}$ Given ${{T}_{1}}={{30}^{0}}\,C,\,\,{{T}_{2}}={{333}^{0}}C,\,\,{{\chi }_{1}}=\chi$ ${{\chi }_{2}}=\frac{{{T}_{1}}}{{{T}_{2}}}\,\chi =\,\frac{30}{333}\chi \,=0.09\,\chi$