Three charges of (+2q), (- q) and (- q) are placed at the corners A, B and C of an equilateral triangle of side a as shown in the figure. The magnitude of dipole moment of this combination is

The charge +2q can be broken in +q, +q. Now as shown in figure, we have two equal dipoles inclined at an angle of 60°. Therefore, resultant dipole moment will bepnet =p2+p2+2ppcos60°pnet=3p=3qa