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Short Note

Give the expression for the magnitude of its electric dipole moment and the direction.

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#### Solution

- The magnitude of the dipole moment is given by the product of the magnitude of one of the charges and the distance between them.

`|vec "P"|` = 2qa

`vec "P" = "qr"_+ + (- "q") vec "r"_-`

where r̂_{+}is the position of vector of +1 from the origin and r̂_{–}is the position vector of -q from the origin

`vec "P" = "qai" - "qa"(- hat"i") = 2 "qai"` - It is a vector quantity having direction along the dipole axis -q to +q.
- Unit: coulomb metre (Cm).

Concept: Electric Dipole and Its Properties

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