1. The problem statement, all variables and given/known data I have this picture http://i.imgur.com/ek2N1dL.png I have to find the electric field at the point inside 2 semi circles. The left semi circle has a charge of -3 micro Coulombs and the right one has +3 micro coulombs. The radius between the point and the circle is 0.2 meters. 2. Relevant equations Electric field = ∫kdq/r2 3. The attempt at a solution I know what the FBD looks like and how to solve a problem for one semi circle alone but adding that other piece is really throwing me off. What should I keep in mind when solving this?