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 am not too sure on how to solve this, so a little help would be good. Nothing is listed in my textbook about how to approach this. I was thinking of using the distance formula from mat, but I don't know how to incorporate the charges into the problem.