Chapter 22, Problem 57GP

A point charge Q is placed a distance r₀/2 above the surface of an imaginary spherical surface of radius r₀ (Fig. 22–43). (a) What is the electric flux through the sphere? (b) What range of values does E have at the surface of the sphere? (c) Is $\stackrel{\to }{E}$ perpendicular to the sphere at all points? (d) Is Gauss’s law useful for obtaining E at the surface of the sphere?

FIGURE 22–43 Problem 57.