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5. Magnetism and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics5. Magnetism and matter1 Mark
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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