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## Homework Statement

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?

## Homework Equations

E = Q*r/(4*pi*Eo*R^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.