The electromagnetic mass of a charged object can be calculated by three independent methods: (1) mu=u/c2, where u is the field energy of the object at rest, (2) mp=p/v, where p is the field momentum when the particle is moving at speed v, and (3) ms=F/a, where F is the self‐force when the object has acceleration a. In the context of a simple dumbbell model we demonstrate that mp=ms, but these in general exceed mu.

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