A hollow metal sphere of radius $R$ is uniformly charged. The electric field due to the sphere at a distance $r$ from the centre:

[Image showing the electric field intensity graph for a uniformly charged hollow spherical shell]Inside the sphere ($r<R$): There is no enclosed charge ($q_{en}=0$). According to Gauss's Law, the electric field is zero.Outside the sphere ($r>R$): The field behaves as if the entire charge were concentrated at the center. $E=\frac{1}{4\pi {ϵ}_0}\frac{Q}{r^2}$. As $r$ increases, the field decreases (inverse square law).