A static-electricity experiment utilizes a plastic sphere with a 0.79 cm diameter and a uniformly distributed 36 pC charge on its surface.

1. If the electric potential far from the plastic sphere is zero, what is the electric potential, in volts, at a point infinitesimally outside its surface?

V = ? V

2. If the electric potential far from the plastic sphere is zero, what is the electric potential, in volts, at a point infinitesimally inside its surface?

V = ? V