Chapter 3.2, Problem 3.9P

In Ex. 3.2 we assumed that the conducting sphere was grounded $\left(V=0\right)$ . But with the addition of a second image charge, the same basic modelwill handle the case of a sphere at any potential $V_0$ (relative, of course, to infinity). What charge should you use, and where should you put it? Find the force ofattraction between a point charge q and a neutral conducting sphere.