Figure 19-42 shows a system consisting of three charges , , and , at the vertices of an equilateral triangle of side .
(a) Find the magnitude of the electric field at a point halfway between the charges q1 and q2.
(b) Is the magnitude of the electric field halfway between the charges q2 and q3 greater than, less than, or the same as the electric field found in part (a)?
(c) Find the magnitude of the electric field at the point specified in part (b).
