Question
Explain in short about electric dipole.

Answer

►A system consisting of two equal and opposite charges at some distance is called electric dipole.
►The total charge of the electric dipole is obviously zero. This does not mean that the field of the electric dipole is zero. Since the charge q and - q are separated by some distance, the electric fields due to them, when added, do not exactly cancel out.

Image
►The product of the magnitude of any electric charge on an electric dipole and the distance (2a) between them is called the electric dipole moment.
►Electric dipole moment $\vec{p}=\overrightarrow{2 a} q$
►SI unit of electric dipole moment is Cm (Coulomb meter), Dimensional formula is $M ^0 L^1 T^1 A^1$

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