Q. Which one of the following graphs represents the variation of electric field with distance $r$ from the centre of a charged spherical conductor of radius $R$?
Solution:
Electric field due to a hollow spherical conductor is governed by the following equation
$ E=0 $ for $ r < R $ ...(i) and $ E=\frac{Q}{4\pi {{\varepsilon }_{0}}{{r}^{2}}} $ for $ r\ge R $ ie, inside the conductor field will be zero and outside the conductor field will vary according to
$ E\propto \frac{1}{{{r}^{2}}} $
