1. The problem statement, all variables and given/known data A point charge q = -8 µC is surrounded by two thick, conducting spherical shells of inner and outer radii a1 = 0.2 m, a2 = 0.3 m, a3 = 0.8 m, and a4 = 0.9 m respectively. The inner shell is uncharged; the outer shell has a net charge Q = -8 µC. At this point in the problem, the potential at infinity is unspecified. Do not assume it is zero. If now you are given V(inf) = 1 x 105 V, find the potential at r = 0.1 m. 2. Relevant equations V = ∫E*dr 3. The attempt at a solution voltage from .1 m to .9m = -359672 + -149863 = -509535 (known from previous steps) I have no idea how to get the voltage from .9m to infinity!