1. The problem statement, all variables and given/known data a ball with a mass of 0.450 g and positive charge of q=31.1 μC is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of θ=19.0o from the vertical. What is the magnitude of the electric field? 2. Relevant equations Force of y component=massxGravity x component= Force of y component Tan angle 3. The attempt at a solution converted mass to kg. F= .00045 X 6.67E-11= 3.00015E-14 3.00015E-14 Tan 19= 1.034E-14 convert to Coulombs. 1.034E-14/3.11E-5 =3.32E-10 but answer in incorrect any suggestions what I am doing wrong? I tried doing it without converting to kg and got the answer 3.32E-7 and that was wrong as well.