# Illustration Electric Field Graph (inside / outside) - Hollow sphere

Diagram of the electric field $$E(r)$$ of a hollow sphere as a function of distance $$r$$. The hollow sphere has the radius $$R$$.
• Outside ($$r \gt R$$) of the hollow sphere, the E-field is proportional to $$1/r^2$$ as for a point charge.
• Inside ($$r \lt R$$), however, the E-field is zero (Faraday cage).