1. The problem statement, all variables and given/known data This was on the 1982 AP Physics C E&M Free Response 2. Relevant equations Electric flux through a closed surface = (Charge enclosed)/epsilon_0 3. The attempt at a solution This is the official solution given: I believe, however, that the electric flux must be undefined. The electric flux is the integral of E.dA. But since there are charges *on* (as opposed to inside) two of the points on the sphere, E at those points would be infinite. Thus, integral E.dA would be undefined. Any help would be greatly appreciated. Thank You in Advance.