1. The problem statement, all variables and given/known data Two particles with positive charges q1 and q2 are separated by a distance s. Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? 2. Relevant equations Express your answer in terms of some or all of the variables s , q1 , q2 and k=1/(4pi epsilon) 3. The attempt at a solution I got s=sqrt(q1(d-s)^2 / q2), but i think its wrong. Anyone who knows?