A solid metal sphere with radius $R$ is isolated in space. It carries a positive charge such that the electric potential at its surface is $V_S$. At the surface, the electric field strength is $E_S$.
(a)[3]
Using the axes of Fig. 6.1, indicate how the electric potential varies with distance $x$ from the centre of the sphere for values of $x$ from $x = 0$ to $x = 3R$.
(b)[3]
On the axes of Fig. 6.2, show how the electric field strength varies with distance $x$ from the centre of the sphere for values of $x$ from $x = 0$ to $x = 3R$.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “For $x = 0$ to $x = R$, the potential stays constant at $V_s$” …