1. The problem statement, all variables and given/known data A hollow conducting sphere carries a charge of 72nC and has an inner radius of 44cm and an outer radius of 68cm. At the center of the hollow sphere is a point charge (-89)nC, insulated from the sphere. What is the magnitude of the electric field inside the sphere at a distance of 9.5cm from the inner surface? 2. Relevant equations E = Q*r/(4*pi*Eo*R^3) 3. The attempt at a solution I don't find my teacher notes helpful. I've been googling on Gauss Law and i know about the concepts. The problem is I am lost on where to start off the problem. I just don't understand what to do. Anyhelp will be appreicated. Thanks.