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# The susceptibility of magnetism at book is $1.2 \times 10^{-5}$ At what temperature will the susceptibility be equal to $1.44 \times 10^5?$

$\begin{array}{1 1} 200\;K \\ 150\;K \\ 250\;K \\ 100\;K \end{array}$

$\psi=\large\frac{c}{T} \large\frac{\psi _m}{\psi' m}$
$\quad= \large\frac{T'} {T}$
$T'= \large\frac{\psi _m}{\psi ' _m}$$\times T \quad= \large\frac{1.2 \times 10^{-5}}{1.44 \times 10^{-5}}$$\times 300$
$\quad= 250\;k$
Answer : $250\;K$