Halliday, Resnick & Walker — Gauss' Law: Problem 28

28 Figure 23-35 shows a spherical shell with uniform volume charge density \(\rho = 1.56 \text{ nC/m}^3\), inner radius \(a = 10.0 \text{ cm}\), and outer radius \(b = 2.00a\). What is the magnitude of the electric field at radial distances (a) \(r = 0\); (b) \(r = a/2.00\), (c) \(r = a\), (d) \(r = 1.50a\), (e) \(r = b\), and (f) \(r = 3.00b\)?