(a)[2]
Define electric potential at a point in an electric field.
(b)
A positively charged isolated solid metal sphere is shown. The way the potential $V$ varies with distance $x$ from the centre of the sphere appears in Fig. 5.1. Use Fig. 5.1 to suggest
(b(i))[1]
why the sphere’s radius cannot be more than $1.0\,\text{cm}$.
(b(ii))[3]
that the charge on the sphere acts as though it were a point charge.
(c)[2]
Assuming that the charge on the sphere does act like a point charge, use data from Fig. 5.1 to find the charge on the sphere.