Given below are two statements: Statement I: Susceptibilities of… | JEE Main 2022 (25 Jun, Shift 2)

Q17JEE Main 2022 · 25 JUN · SHIFT 2Medium

Magnetic Materials & Curie Law

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:

Show answer and solution

Answer: (a)

Statement I is true. For a paramagnet $\chi = C/T$ , and for a ferromagnet above $T_C$ , $\chi = C/(T - T_C)$ . Both increase as $T$ decreases.
Statement II is true. An applied field changes the orbital motion of electrons and induces magnetic moments opposite to the field (Lenz's law). This is diamagnetism.
So the answer is (a): both statements are true.

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