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Poynting theorem
Poynting theorem (ˈpɔɪntɪŋ) n (General Physics) the theorem that the rate of flow of electromagnetic energy through unit area is equal to the Poynting vector, i.e. the cross product of the electric and magnetic field intensities[C19: named after John Henry Poynting (1852–1914), English physicist]
Poynting theorem
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. |