Find (a) the direction and (b) the magnitude of the net electric field at the center of th...

Find (a) the direction and (b) the magnitude of the net electric field at the center of the equilateral triangle in Figure 19−31. Give your answers in terms of the angle θ, as defined in Figure 19−31, and E, the magnitude of the electric field produced by any oneof the charges at the center of the triangle.

FIGURE 19-31 Problem