1. The problem statement, all variables and given/known data An insulating hollow spherical shell of radius R has a small hole on it .The shell has a charge Q uniformly distributed over it. What is the electric field strength at the center of this hole? 2. Relevant equations 3. The attempt at a solution If the hole weren't present ,the electric field due to the shell just above the surface would have been kQ/R2 . Now I am not sure how does the hole influences the electric field . Another doubt I am having is shouldn't the question ask about the electric field just above the hole instead of at the center of the hole ? Could someone help me with the problem ?