Chapter 17.8, Problem 27E

Divergence Theorem for more general regions Use the Divergence Theorem to compute the net outward flux of the following vector fields across the boundary of the given regions D.

27.     $F=\frac{r}{\left|r\right|}=\frac{\langle x,y,z\rangle }{\sqrt{x^2+y^2+z^2}}$; D is the region between the spheres of radius 1 and 2 centered at the origin.