The magnetic susceptibility of a paramagnetic material at -73 is 0.0075. Its value at -173 will be (a) 0.0150 (b) 0.0075 (c) 0.0030 (d) 0.0045

Answer: (a). Curie's law: χ ∝ 1/T, so (χ₂)/(χ₁) = (T₁)/(T₂). T₁ = -73 + 273 = 200 K and T₂ = -173 + 273 = 100 K. χ₂ = 0.0075 × (200)/(100) = 0.0150 So the answer is (a) 0.0150.

The magnetic susceptibility of a paramagnetic material at -73 is… | MHT CET 2020 (16 Oct, Shift 2)

Q25MHT CET 2020 · 16 OCT · SHIFT 2Medium

Magnetic Materials & Curie Law

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

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Answer: (a)

Curie's law: $\chi \propto \dfrac{1}{T}$ , so $\dfrac{\chi_2}{\chi_1} = \dfrac{T_1}{T_2}$ .
$T_1 = -73 + 273 = 200\text{ K}$ and $T_2 = -173 + 273 = 100\text{ K}$ .
$\chi_2 = 0.0075 \times \dfrac{200}{100} = 0.0150$
So the answer is (a) 0.0150.

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