Quote: if an electrical charge is suddenly moved, its effect is delayed and the electromagnetic field contains the momentum; the sum of field momentum and particle momentum is conserved
… if an electrical charge at one location is … little delay. … In that tiny time the momentum of the … We represent this by saying that during this … momentum in the electromagnetic field. If we add … all the time. The fact that the electromagnetic … "
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Quote: an electromagnetic field is real because it can possess momentum and energy