Chapter 18, Problem 5P

* Use the superposition principle to draw $\stackrel{\to }{E}$ field lines for the following objects whose charges are given. Consider all objects to be point-like and choose the distance you want between them: $\left(\text{a}\right)\text{ + }q\text{ and -3}q\text{;}\left(\text{b}\right)\text{ +}q\text{, +}q\text{, and -3}q$.