State and explain Curie's law in magnetism.

Explanation

According to Curie.s law, the magnetisation M developed in a paramagnetic material is directly proportional to the applied magnetic field By and inversely proportional to the absolute temperature T i.e.
`M prop (B_0)/(T) ` or ` M = C (B_0)/(T)`
Where C is a constant for given material and is known as Curie.s constant . As a termperature of a paramagnetic material is reduced the magnetisation vector increases.
In terms of magnetic susceptibility x, Curie.s law for paramagnetic materials may be expressed as :
`x = C/T`