Walker, Halliday & Resnick — Gauss' Law: Problem 38

38 Figure 23-41 shows two nonconducting spherical shells fixed in place on an x axis. Shell 1 has uniform surface charge density \( +5.0 \text{ \mu C/m}^2 \) on its outer surface and radius 0.50 cm, and shell 2 has uniform surface charge density \( -2.0 \text{ \mu C/m}^2 \) on its outer surface and radius 2.0 cm; the centers are separated by \( L = 6.0 \text{ cm} \). Other than at \( x = \infty \), where on the x axis is the net electric field equal to zero?