A recent article claims that the Lorentz force law is incompatible withspecial relativity. We discuss the "paradox" on which this claim is based. Theresolution depends on whether one assumes a "Gilbert" model for the magneticdipole (separated monopoles) or the standard "Ampere" model (current loop). Theformer was presented in these pages many years ago; the latter requires theinclusion of "hidden momentum."
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