Abstract
The general expression for the magnetic moment of arbitrary order of a circular current loop about any point on its axis is derived, and used to obtain the magnetic moments of systems of current loops. A magnetic multipole apparatus suitable for the physics teaching laboratory is described. The apparatus enables the student to measure the magnetic field configuration of a single large coil and of systems of one or more small coils, and results obtained with it are presented. The potential role of the nuclear magnetic octupole moment in nuclear structure studies is indicated by deriving the M3/M1 ratio of three spheroidal current distributions.
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