I do not manage to visualize the link between the component of the quadrupole Q_ij and the spatial distribution of the electric quadrupole field.
I was told to imagine the Q_ij as an ellipsoid, which I understand (the ellipsoid "radius" in a given direction being the strength of the...
I want to derive the electric field vector from a quadrupole potential.
I am starting from
and I am considering E=-∇\phi
with \phi=1/2 Qijxixj/r5
I am very unsure if I carry out the thing properly, I would appreciate your comments...