Physics - Current Electricity Question with Solution | TestHub

A metal sphere of radius $a$ is surrounded by a concentric metal sphere of inner radius of $b$, where $b>a$. The space between the spheres is filled with a material whose electrical conductivity $\sigma$ varies with the electric field strength E as $\sigma =\mathrm{kE}$ where k is a constant. A potential difference V is maintained between spheres.