• # question_answer The magnetic susceptibility of a paramagnetic substance at $-73\text{ }{}^\circ C$ is 0.0060, then its value at $-173\,{}^\circ C$ will be- A) 0.0030             B) 0.0120C) 0.0180             D) 0.0045

${{\chi }_{m}}\,\propto \,\frac{1}{T}\,\,\Rightarrow \,\,\frac{{{\chi }_{1}}}{{{\chi }_{2}}}\,\,=\,\,\frac{{{T}_{2}}}{{{T}_{1}}}\,=\,\,\frac{100}{200}\,\,=\,\,\frac{1}{2},\,\,{{\chi }_{2}}\,\,=\,\,2{{\chi }_{2}}$