(a)[3]
The potential at the sphere’s surface is $V_0$. On the axes in Fig. 5.1, sketch a graph to show how the electric potential from the charged sphere varies with distance $x$, for $x = 0$ to $x = 4r$.
(b)[3]
The electric field strength at the sphere’s surface is $E_0$. On the axes in Fig. 5.2, sketch a graph to show how the electric field strength due to the charged sphere varies with distance $x$, for $x = 0$ to $x = 4r$.