1. The problem statement, all variables and given/known data So this was a problem worked in class by the professor in class. Find the net electric field at the origin due to the arcs 2. Relevant equations L=2πr/4 λ=q/L E=kQ/r2 3. The attempt at a solution So the professor gave the answer using the fromula Enet=λ1(2sin45°)/(4πε0r1)+λ2(2sin45°)/(4πε0r2)+λ3(2sin45°)/(4πε0r3) I can understand the formula except for where the 2sin45° comes from. I mean the arc is a quarter circle of 90° in the second quadrant but I am unsure where this term comes from and how it would change if the parameters of the problem were to change.