Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?

Explanation

(a) When any paramagnetic sample is cooled down, average kinetic energy of thermal vibrations of atomic dipoles decreases. As a result, angle between `overset(to) (m)and overset(to)(B)` decreases. In other words, atomic dipoles tend to be aligned more and more in the direction of external magnetising field `overset(to) (B)`. That is why such a sample shows more magnetisation with the same magnetising field.