Electric Forces...need help!! 1. The problem statement, all variables and given/known data Two small plastic spheres each have a mass of 2.85 g and a charge of -39 nC. They are placed 3.06 cm apart (center to center). A. What is the magnitude of the electric force on each sphere? B. By what factor is the electric force on a sphere larger than its weight? 2. Relevant equations 3. The attempt at a solution A. K*q*q / r^2 = 0.0146 N B. I thought I could just do 0.0146 N / (0.00285kg * 9.81 m/s^2) = 0.523........is that right???