A non-conducting solid sphere of radius $R$ is uniformly charged. The magnitude of electric field due to the sphere at a distance $r$ from its centre.

Inside the sphere i.e. for $r<R$

$$\begin{gathered} E=\frac{1}{4\pi {\epsilon }_0}\frac{Q}{R^3}r \\ \Rightarrow E\propto r \end{gathered}$$

i.e., $E$ at centre is $E_{centre}=E{|}_{r=0}=0\left(r=0\right)$

and $E$ at surface is $E_{surface}=E{|}_{r=R}=\frac{1}{4\pi {\epsilon }_0}\frac{Q}{R^2}$

Outside the sphere, i.e. for $r>R$

$$\begin{gathered} E=\frac{1}{4\pi {\epsilon }_0}\frac{Q}{r^2} \\ \Rightarrow E\propto \frac{1}{r^2} \end{gathered}$$

Thus, variation of electric field $\left(E\right)$ with distance $r$ from the centre will be as follows.