Q 12-05-076JEE MainJEE Main 2019 (12 Jan, Shift 2)Easy
A paramagnetic material has $10^{28}$ atoms m$^{-3}$. Its magnetic susceptibility at temperature $350$ K is $2.8\times10^{-4}$. Its susceptibility at $300$ K is
Answer: (C) $3.267\times10^{-4}$
Curie's law: $\chi \propto \dfrac1T$.
$$\chi_{300} = 2.8\times10^{-4}\times\frac{350}{300} \approx 3.267\times10^{-4}$$
Solution by Sreeraj P, M.Sc Physics