1. The problem statement, all variables and given/known data http://i39.tinypic.com/qsp1rr.jpg Determine the magnitude of the electric field at point P. 2. Relevant equations lambba=(q/l) Length of arc = (radius)(radians) There's another equation with a sin60 in it that gives the answer, but I forgot what it is... 3. The attempt at a solution I first tried getting lambda by diving the charge 8e-6C by the length of the arc, .418m, then put that in this equation: [(lambda)/(4piEo)]int(1/r^s) but that didn't give me the right answer, which is 1.49e6 N/C upwards. I know the answer and most of the information, I just don't know what equation to apply to it.