1. The problem statement, all variables and given/known data Two positive charges of 16 micro coulomb and 4 micro coulomb are separated by a distance 3 m along a straight line....find the spot on the line joining the two charges where Electric field is zero? 2. Relevant equations E = F/Q and F = Q1Q2/R^2 3. The attempt at a solution AS i tried it i thought electric field is zero when forces b/w two charges will become equal,i took a point P on a line,so that E2 is a distance "d" from P,and E1 is at a distance "3-d" from p...so i applied F1=F2 but the answer came out to be 3 which wasn't actually,i checked the textbook and they equalled E1=E2 actually i know its solution but couldn't grasp the idea of the difference b/w electric field/coloumb's law and electric force? i couldn't help thinking my self it can also to be F1 = F2 but why it is E1 = E2??? what is the idea notion behind it? please can anyone explain it in layman's terms?