Electric Potential From Electric Field

1. Oct 1, 2009

doubedylan

1. The problem statement, all variables and given/known data
Two particles, of charges q1 and q2 are separated by distance d. The net electric field due to the particles is zero @ x=d/4.
With V=0 @ infinity, locate (in terms of d) any point on the x axis (other than infinity) at which the electric potential due to the two particles is zero.

2. Relevant equations
V=-$$\int$$$$^{f}_{i}$$ ($$\vec{E}$$ $$\bullet$$ d$$\vec{s}$$)

3. The attempt at a solution
Seems too obvious to be true, but I think V = 0 @ d/4 since E=0 as well.
Anyone see where else is could be?

2. Oct 1, 2009

w3390

Pretend like the two particles are equidistant from the origin, therefore the origin is the middle of the two charges. When finding potential at a point, it is the potential of one charge on the point plus the potential of the other charge on the point. Potential is not a vector, so I believe if the charges are the same, you will find your answer in the middle of the two charges.