Given below are two statements: Statement- I : Susceptibilities o… - Vidyadip

MCQ

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 : -

✓
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

Correct option: A.

Both statement$- I$ and statement $-II$ are true.

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 and the relation is given as $\chi=\frac{ C }{ T - T _{ C }} \quad\left( T _{ C }\right.$ is curie temperature)

Diamagnetism is due to non-cooperative behaviour of orbiting electrons when exposed to external magnetic field.

Hence option $(A).$

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