Question

The susceptibility of a magnetism at $300\, K$ is $1 .2 � 10^{-5}$. The temperature at which the susceptibility increases to $1 .8 � 10^{-5}$ is

• A. 150 K
• B. 200 K
• C. 250 K
• D. 20 K

Answer 1

Answer: (B)

200 K

Answer 2

Here, Magnesium is a paramagnetic substance and it follows, $\chi= C \frac{\mu_{0}}{ T }$ i.e $(\chi \times T)=$ constant In first case, $\chi \times T =360 \times 10^{-5}$ In second case, $360 \times 10^{-5}=1.8 \times 10^{-5} \times T$ $T =200 \,K$