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**1. Problem Statement:**

Find positions on the x-axis for the charges Q1 = -1 C and Q2 = +3 C so that the electric field is zero at x = 0.

## Homework Equations

:[/B]I'm thinking I need to use Coulomb's law for this one. I'm just having trouble figuring out where to start. Coulomb's states E=kQ/r^2.

**3. My Attempt:**

So far I have set up a drawing. I am not sure if I need to be considering the electric field lines for this and if they have a role in the problem. I have considered using the forces to try to relate the distances between the three points but I have had no luck.