Discussion Forum

A solid sphere of radius R carries a uniform volume charge density $\rho$. The magnitude of the electric field  inside the sphere at a distance  r from the centre is 

Answer:

Explanation:

$E= \frac{1}{4\pi\epsilon_{0}}\frac{qr}{R^{3}}=\frac{q}{\frac{4}{3}\pi R^{3}}\times\frac{r}{3\epsilon_{0}}=\frac{\rho\times r}{3\epsilon_{0}}$