Question

A sphere with radius R is uniformly charged with a total charge of Q. The magnitude of the electric field at a distance R/2 from the sphere's centre is:

Answer 1

The electric field inside sphere:

$$E=\frac{kq}{R^3}r$$

$$E=\frac{kq}{R^3}0.5R=\frac{kq}{2R^2}$$