Question

Given below are two statements:
Statement - I : Susceptibilities of paramagnetic and ferromagnetic substances increase with decrease in temperature.
Statement - II: Diamagnetism is a result of orbital motions of electrons developing magnetic moments opposite to the applied magnetic field. Choose the CORRECT answer from the options given below : -

• A. Both statement - I and statement - II are true.
• B. Both statement - I and Statement - II are false.
• C. Statement - I is true but statement - II is false.
• D. Statement-I is false but Statement-II is true.

Answer 1

Answer: (A)

According to curie's law, magnetic susceptibility is inversely proportional to temperature for a fixed value of external magnetic field i.e. $\chi =\frac{C}{T}$.
The same is applicable for ferromagnet & the relation is given as $\chi =\frac{C}{T-T_C}(T_C$ is curie temperature)
Diamagnetism is due to non-cooperative behaviour of orbiting electrons when exposed to external magnetic field.