Consider a long cylindrical wire of radius R having uniform current density $\overrightarrow{\mathrm{J}}={\mathrm{J}}_0\hat{\mathrm{k}}$. Axis of this cylindrical wire is along z-axis. A cylindrical wire of radius $\left(\frac{\text{R}}{\text{4}}\right)$ is removed from the cylindrical wire which lead to a cavity. (Axis of this cavity is parallel to z-axis which is passing through the point ${\mathrm{O}}^{\text{'}}(4,3)$. Cross sectional view of the wire is shown in diagram. On the basis of above paragraph answer the following questions