# Electric Dipole Field

Greetings,

I wonder with respect to what coordinates the formulas given for the electric dipole is valid. Also I want to comprehend the difference between pure and physical dipoles and why many books put the origin of the cartesian system they define on the middle point of the electric dipole moment vector( I think they should put the origin at the tail of the vector). Any insight is welcome.

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Simon Bridge
Homework Helper
Greetings,

I wonder with respect to what coordinates the formulas given for the electric dipole is valid.
Whatever coordinate system the formulas are given in of course. You need to be specific.
Also I want to comprehend the difference between pure and physical dipoles and why many books put the origin of the cartesian system they define on the middle point of the electric dipole moment vector( I think they should put the origin at the tail of the vector). Any insight is welcome.
The books are putting the origin half-way between the charges not the dipole vector - which can be drawn anywhere. They put the origin there to make the math/derivations simpler. You can put the origin anyplace you like.

The difference between real and "pure" or ideal dipoles is the same as real vs ideal anything.
Also see: