Chapter 27 - Gauss's Law - Exercises and Problems - Page 806: 18

See the figures below.

This is a sketching problem. We know that the net electric flux through the closed surface is given by $$\Phi=\dfrac{Q_{in}}{\epsilon_0}$$ We need to find the electric flux from (a) to (d), as we did in the figures below. We need to change the charge inside the Gaussian surface only.