Dipole moment of a specific charge distribution

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The dipole moment of a charge distribution consisting of a negative charge cloud shaped as an ellipsoid and a positive point charge at its center is zero, similar to a spherical distribution where the centers of positive and negative charges coincide. The discussion clarifies that while the dipole moment remains zero, the quadrupole moment is not zero in this configuration. The positive charge is confirmed to be located at the center of the ellipsoid, not at one of the foci. This reinforces the understanding that the symmetry of the charge distribution affects the dipole moment. Overall, the dipole moment for this specific charge distribution is zero, but the quadrupole moment is significant.
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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..
 
The dipole moment is zero, but not the quadrupole moment.
 

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