1. The problem statement, all variables and given/known data A charge Q is arranged evenly on a wire bent into an arc or radius R as shown in the Figure. What is the electric field at the center of the arc as a function of the opening angle theta? Sketch a graph of the electric field as a function of theta for 0<theta<180 degrees. 2. Relevant equations E= KQ/R^2 cos theta 3. The attempt at a solution Is the above equation correct? If not, I'm not really sure what to do, also I'm not sure how the graph should look.