The electric field due to a uniformly charged sphere of radius R as...

The magnitude of the electric field at a point exterior to the sphere is $\frac{1}{4 \pi \varepsilon_0} \frac{Q}{r^2}$. The magnitude of electric field inside the sphere is given by $\frac{1}{4 \pi \varepsilon_0} \frac{Q r}{a^3}$. The field is directly proportional to $r$.