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# Write the definition of electric dipole moment.

Last updated date: 03rd Mar 2024
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Hint: A pair of equal and opposite charges (i.e. +q and -q) separated by a certain distance is known as an electric dipole. The centre of the electric dipole is the midpoint of the system of two charges which is referred to as electric dipole. The electric dipole moment is used to find the direction of the source of electric field in the electric dipole.

Electric dipole moment: It may be defined as the product of magnitude of separation of equal and opposite charges (either charge) in a system through a small distance. It is a vector quantity. Its direction is from negative charge to positive charge.

Mathematically, it is represented by $p$ and is equal to –
$p = q \times d$
In vector form,
$\overrightarrow{p}=q\times \overrightarrow{d}$
Where q is the magnitude of either charge and d is the distance between the two equal and opposite charges.
SI unit of electric dipole moment is C-m (coulomb-meter). Its other unit is Ampere-second.