Question

The magnetic susceptibility of a paramagnetic material at $-73{}^{\circ }\text{C}$ is $0.0075$. Its value at $-173{}^{\circ }\text{C}$ will be -

$[$Assume the states are far away from saturation$]$

• A. $0.0045$
• B. $0.0030$
• C. $0.015$
• D. $0.0075$

Answer 1

The correct option is C $0.015$

We know that, for paramagnetic material, at states far away from saturation,

$\chi T=\text{constant}$

$\Rightarrow {\chi }_1{T}_1={\chi }_2{T}_2$

$\Rightarrow 0.0075\times (-73+273)={\chi }_2\times (-173+273)$

We get, ${\chi }_2=0.015$