Abstract:Multipole expansions of electric charge and current distributions and the fields those multipoles create are a fundamental pillar of electromagnetic theory, but explanations and examples are rare beyond a dipole. In this paper we describe a low-cost exploration of magnetic multipoles. Using the field from ideal magnetic dipoles and a simple binomial approximation, we show that each multipole obeys B ∝ r n , with n = −3, −4, −5, −6 for a dipole, quadrupole, sextupole, and octupole, respectively. Using commercia… Show more
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