Chapter-1|Electric Charges and Fields | NCERT 12th Physics:
Electric Dipole:
A pair of equal and opposite charges separated by a small distance is called an electric dipole.
The midpoint of -q and +q is called the centre of the dipole.
Dipole Moment of an Electric Dipole:
The strength of an electric dipole is measured by a vector quantity known as electric dipole moment(p), which is the product of the either charge(q) and separation between the charges(2l).
Dipole Moment = Either charge × a vector drawn from negative to positive charge