Total Electric Potential, when is it zero?

[aeromat]

Homework Statement

A charge of +6.0µC at point A is separated 10.0 cm from a charge of -2.0µC at point B. At what locations on the line that passes through the two charges will the total electric potential be 0?

The Attempt at a Solution

[(+) A] ------------------------------ [(-) B]I know that for them to cancel out each other, then they must be equal to each other. However, I don't know how to proceed to determine where the right location would be.

 

[ideasrule]

Suppose you pick a point that's a distance "x" from A, and therefore 10 cm - x from B. Can you write out the electric potential at that point? If so, just set it to 0 and solve for x.

 

[AlexChandler]

Yes, there are three main sections that the point may be (between the charges, or on either side) Try all of these possibilities and see if you can make one of them work.