A infinitely lay solid non conducting cylinder has radius ‘r’ and charge density $\mathrm{\rho } \mathrm{colu} {\mathrm{m}}^{-3}.$ Electric field at distance x from its centre is (x < r)

On assuming a Gaussian surface of radius 'x' inside the sphere,

${\mathrm{q}}_{\mathrm{enclosed}}=\mathrm{\rho }\frac{4}{3}{\mathrm{\pi x}}^3$

using Gauss law, $\mathrm{E}.4{\mathrm{\pi x}}^2=\frac{\mathrm{\rho }{\displaystyle \frac{4\mathrm{\pi }}{3}}{\mathrm{x}}^2}{{\mathrm{\epsilon }}_{\mathrm{o}}}\Rightarrow \mathrm{E}=\frac{\mathrm{\rho x}}{3{\mathrm{\epsilon }}_{\mathrm{o}}}$

A solid non conducting sphere has charge density ${\mathrm{\rho Cm}}^{-3}$. Electric field at distance x from its centre is  $\frac{\mathrm{\rho x}}{3{\mathrm{\epsilon }}_0}$