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?
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 dont 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?