$\begin{aligned} & \text { Magnetisation, } M=\frac{\mathrm{m}_{\text {net }}}{\mathrm{V}} \\ & \therefore \quad \mathrm{m}_{\text {net }}=\mathrm{M} \times \mathrm{V}=\mathrm{M} \times\left(\pi \mathrm{r}^2 l\right)=\mathrm{M} \times \pi \times \frac{\mathrm{d}^2}{4} \times l \\ & =5.3 \times 10^3 \times 3.142 \times\left(\frac{1 \times 10^{-2}}{2}\right)^2 \times 5 \times 10^{-2} \\ & =2.08 \times 10^{-2} \mathrm{~J} / \mathrm{T} \\ & \end{aligned}$