Here is the problem :
ill write it out again aswell
A particle with charge +9 μC is placed at the origin, and another particle of charge –2 μC is at x = L. At what two points is the net electrostatic potential equal to zero?
The Attempt at a Solution
I could understand if they were the same sign charges then there would be an area of 0 field strength.
Could someone please explain to me whats going on and how to solve it.