Dipole moment of a specific charge distribution

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Alimpaj
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A negative charge cloud distribute as a ellipsoid and a positive point charge situated at the centre of the ellipsoid.What should be the dipole moment of charge distribution.I mean, if the negative charge distribution is spherical and positive point charge at the centre then surely dipole moment is zero because positive and negative charge centre coincide.Is this the same case for the ellipsoid charge distribution or something else..
 
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where is the positive charge-center or at one of the foci?
 
AURUM said:
where is the positive charge-center or at one of the foci?
The positive charge located at the centre of the ellipse..