(a)[3]
Use Fig. 5.1 to find the electric field strength, in $\text{N C}^{-1}$, at the position where $x = 4.0\,\text{cm}$. Show your working.
(b(i))[1]
The charge on the sphere is $8.0 \times 10^{-9}\,\text{C}$. Use Fig. 5.1 to state the electric potential at the surface of the sphere.
(b(ii))[2]
The sphere behaves as a capacitor. Determine the capacitance of the sphere.
(ii)[2]
The sphere behaves as a capacitor. Determine the capacitance of the sphere.