Physics - Magnetism Question with Solution | TestHub

Magnetic susceptibility $\left({\chi }_{\mathrm{m}}\right)$ is defined as the ratio of the intensity $(I)$ of magnetisation to the magnetic intensity $(H)$ of the magnetising field, that is ${\chi }_m=\frac{I}{H}$ It is a pure number, because $I$ and $H$ have the same unit. Its value for vacuum is zero as there can be no magnetisation in vacuum.