Electric Dipole

Key Idea Electric dipole moment is a vector quantity directed from negative charge to the similar positive charge. Choose the three coordinate axes as and and plot the charges with the given coordinates as shown. O is the origin at which charge is placed. The system is equivalent to two dipoles along and directions respectively. The dipole moments of two dipoles are shown in figure.The resultant dipole moment will be directed along OP where The magnitude of resultant dipole moment is