Question

Define electric dipole moment. Give its unit.

Answer 1

Two equal and opposite charges separated by a very small distance constitute an electric dipole. Two point charges $+q$ and $-q$ are kept at a distance $2d$ apart. The magnitude of the dipole moment is given by the product of the magnitude of the one of the charges and the distance between them.

Electric dipole moment, $p=2qd$.
It is a vector quantity and acts from $-q$ and $+q$. The unit of dipole moment is $Cm$.