Charges of +q are located at the two bottom corners of an equilateral triangle with sides of length a. A charge of ?2q is at that top corner. This arrangement of charge can be considered two dipoles oriented at 60 ? with respect to one another. Find the magnitude of the electric field at the center of the triangle assuming q = 1 nC and a = 1 cm.

b+ a a -2q a b+ X