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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»

(A) Both statement – I and statement -II are true

According to curie's law, magnetic susceptibility is inversely proportional to temperature for a fixed value of external magnetic field i.e. \(\chi\) = C/T.

The same is applicable for ferromagnet & the relation is given as \(\chi=\frac{C}{T-T_C}\)(TC is curie temperature.)

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



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