Axial multipole moments are a series expansion of the electric potential of a charge distribution localized close to the origin along one Cartesian axis, denoted here as the z-axis. However, the axial multipole expansion can also be applied to any potential or field that varies inversely with the distance to the source, i.e., as 1 R {\displaystyle {\frac {1}{R}}} .
Axial multipole moments are a series expansion of the electric potential of a charge distribution localized close to the origin along one Cartesian axis, denoted here as the z-axis. However, the axial multipole expansion can also be applied to any potential or field that varies inversely with the distance to the source, i.e., as 1 R {\displaystyle {\frac {1}{R}}} .
Source: Wikipedia "Axial multipole moments" · CC BY-SA 4.0
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