Poynting theorem

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Poynting theorem [′pȯint·iŋ ‚thir·əm]

(electromagnetism)

A theorem, derived from Maxwell's equations, according to which the rate of loss of energy stored in electric and magnetic fields within a region of space is equal to the sum of the rate of dissipation of electrical energy as heat and the rate of flow of electromagnetic energy outward through the surface of the region.

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