What is an Electric Dipole and Electric dipole moment , S.I Unit , Dimensional Formula

Definition of Electric dipole : 

A pair of two equal and opposite charges seperated by a small distance is called an electric dipole.

Total charge on electric dipole = +q + (-q) = 0. However the charge on electric dipole is equal to the magnitude of either charge of the electric dipole 

Examples of electric dipoles : Molecules of water $(H_{2}O)$ , ammonia $(NH_{3})$ , hydrochloric acid (HCL), carbon dioxide $(CO_{2})$, Sodium chloride (NaCl) , alcohal etc 

Electric Dipole Moment : 

Electric dipole moment of an electric dipole is defined as the product of the magnitude of either charge of the electric dipole and the dipole length. 

$$\vec{p} = q(2 \vec{l})$$

The magnitude of the dipole moment is 

$$p = q \times 2l$$

The direction of dipole moment $\vec{p}$ is from negative to positive charge.

Dipole moment is a vector quantity.

S.I unit of dipole moment :

$(\vec{p})$ is Coulomb metre (C-m)

Dimensional formula of dipole moment :

$$p = q \times 2l$$

$$p = I.t. 2l$$

$$p = A.T.L$$

$$[M^{0}L^{1}T^{1}A^{1}]$$