Chapter 21.3, Problem 21.3GI

A spherical surface surrounds an isolated positive charge, as shown. (1) If a second charge is placed outside the surface, which of the following will be true of the total flux through the surface? (a) It doesn’t change; (b) it increases; (c) it decreases; (d) it increases or decreases depending on the sign of the second charge. (2) Repeat for the electric field on the surface at the point between the charges.