# Why is electric field zero inside a hollow metal sphere ?

The figure below shows a hollow metal sphere with a positive point charge $Q$ sitting outside it. What is the electric field at the center of sphere ? The answer is zero (look at here at the beginning of page 4), but I do not understand why?

• Well, have you tried google? Nov 15, 2012 at 0:58
• Simple application of Gauss law Dec 9, 2015 at 12:41