Editing Multipole expansion (section)

==Examples==
There are many types of multipole moments, since there are many types of [[potential]]s and many ways of approximating a potential by a [[series expansion]], depending on the [[coordinate system|coordinates]] and the [[symmetry]] of the charge distribution. The most common expansions include:

* [[Axial multipole moments]] of a {{math|1/''R''}} potential;
* [[Spherical multipole moments]] of a {{math|1/''R''}} potential; and
* [[Cylindrical multipole moments]] of a {{math|ln&thinsp;''R''}} potential

Examples of {{math|1/''R''}} potentials include the [[electric potential]], the [[magnetic scalar potential|magnetic potential]] and the [[gravitational potential]] of point sources. An example of a {{math|ln&thinsp;''R''}} potential is the [[electric potential]] of an infinite line charge.