- #1

danielcheung1

- 4

- 0

## Homework Statement

Two point charges qA and qB are located on the x-axis at x=a and x=b. The figure is a graph of Ex, the x-component of the electric field.

What are the signs of qA and qB?

## Homework Equations

http://session.masteringphysics.com/problemAsset/1071455/4/29.EX31.jpg

## The Attempt at a Solution

I feel like... since the graph is symmetrical, the two charges should be the same sign, eg, either both negative or both positive, but i do not know how to interpret the electric field graph! I don't understand how the electric field lines tell me anything, they are going neither towards or away from the point charges... I'm trying to think if the asymptotes mean anything but I just don't know where to begin?