Here is the problem which I need to solve: The following picture shows a system consisting of three charges, q1 = +4.07 μC, q2 = +4.07 μC, and q3 = -4.07 μC, at the vertices of an equilateral triangle of side d = 2.29 cm. Find the magnitude of the electric field at a point halfway between the charges q1 and q2. Also find the magnitude of the electric field at the point halfway between the charges q2 and q3. I pretty much already got down that I have to use x and y components, and got that E1 and E2 cancel each other out (using the equation E = q/r^2). I just pretty much need to figure out how to get the x and y components for E3, and I think I'll be able to finish up the problem on my own. Thanks.