The nuclear charge (Ze) is nonuniformly distributed within a nucleus of radius R. The charge density, i.e. charge per unit volume, ρ(r) is dependent only on the radial distance r from the centre of the nucleus, as shown in the figure. The electric field is only along the radial direction.
The electric field at r = R is
(a) independent of a
(b) directly proportional to a
(c) inversely proportional to a
(d) none of these
