1. The problem statement, all variables and given/known data There is a point charge Q = 4π nC inside a glass sphere which has the radius 1 m and the dielectric constant εr=10. This sphere is enclosed in a hollow metal sphere with an inner radius of 2 m and a thickness of 0.5 m. The task is to find the amount of the electric field strength in the glass sphere, in the gap between glass and metal, in the metal layer and on the outside. 2. Relevant equations Gauss law of electrostatics. 3. The attempt at a solution As far as I know, the field outside of the metal sphere should be as if the sphere would be a point charge, i.e.E(r)=Q/(4πε0r2). But I am a bit lost at the other parts. Is the field in the glass sphere for instance simply: E(r)=Q/(4π εrε0r2)?