Physics - Electrostatics Question with Solution | TestHub

The magnitude of the electric field at a point exterior to the sphere is $\frac{1}{4\pi {\epsilon }_0}\frac{Q}{r^2}$. The magnitude of electric field inside the sphere is given by $\frac{1}{4\pi {\epsilon }_0}\frac{Qr}{a^3}$. The field is directly proportional to $r$.