poynting theorem

World English Dictionary
Poynting theorem (ˈpɔɪntɪŋ)
 
n
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]

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