1. The problem statement, all variables and given/known data Two charges of value +4C and -16C are seperated by a distance of 3m. At what spot along the line is the electric field is zero? 2. Relevant equations I tried using the equation E = Q / 4pieE(o)r^2 3. The attempt at a solution I get a quadratic equations which cannot be solved, please help me out. It is very urgent.