Four materials A, B, C and D have the magnetic susceptibilities $\chi_{mA}, \chi_{mB}, \chi_{mC}$ and $\chi_{mD}$ respectively. which are related as $\chi_{mD}<\chi_{mC}<\chi_{mB}<\chi_{mA}$. Which material can be magnetised with maximum ease?

B C A D

A

The material with maximum susceptibility is easy to magnetised.Hence A is the material which is easiest to magnetise.