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The susceptibility of a magnetism at $300 \mathrm{~K}$ is $1.2 \times 10^{-5}$. The temperature at which the susceptibility increases to $1.8 \times 10^{-5}$ is
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$200 \mathrm{~K}$
$\begin{aligned} & \chi=\frac{\mathrm{C}}{\mathrm{T}} \\ & \Rightarrow \frac{\chi_{1}}{\chi_{2}}=\frac{\mathrm{T}_{2}}{\mathrm{~T}_{1}} \Rightarrow \frac{1.2 \times 10^{-5}}{1.8 \times 10^{-5}}=\frac{\mathrm{T}_{2}}{300} \\ & \Rightarrow \mathrm{T}_{2} \Rightarrow \frac{12}{18} \times 300=200 \mathrm{~K} \end{aligned}$
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