1. The problem statement, all variables and given/known data https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-xaf1/v/t1.0-9/10155063_1485929725016579_7557468199677155885_n.jpg?oh=d575aa48176de7ecda27201b7ce35a5b&oe=54F7F368&__gda__=1425195231_44abd00cc231109df2fbe8d44cef9869 2. Relevant equations ∫E⋅da⋅n = 4πkQenc ΔV(voltage) = -∫Edr 3. The attempt at a solution To be honest I am having trouble starting the problem and defining the Qenc for the three areas of the sphere. I do believe that for r < R ⇒ E(r) = 2QK/r2 and for r > R ⇒ E(r) = KQ/r2 I know that the answer is listed for R<r<2R but i cant seem to come up with that answer. I think im just having problems with defining the Qenc for R<r<2R does Qenc = 2Qpt charge - Qinduced = Q sound right?