2003 AIPMT Magnetism and MatterParamagnetism and Curie's Law Easy Question 35 of 38 in Magnetism and Matter

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to -

A $\dfrac{1}{T}$
B T
C $\dfrac{1}{T^2}$
D $T^2$

The answer is A.

Solution

Curie's law for paramagnetic substances: $\chi_m = \dfrac{C}{T}$, where C is Curie's constant.
So $\chi_m \propto \dfrac{1}{T}$.
At higher temperature, thermal agitation disturbs the alignment of the atomic magnetic dipoles, so the susceptibility decreases.

Concept Curie's law

Magnetism and Matter in past papers

38 questions from this chapter have appeared across 21 exam years.