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Poynting vector

   Also found in: Wikipedia 0.07 sec.
Poynting vector [′pȯint·iŋ ‚vek·tər]
(electromagnetism)
A vector, equal to the cross product of the electric-field strength and the magnetic-field strength (mks units) whose outward normal component, when integrated over a closed surface, gives the outward flow of electromagnetic energy through that surface.


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According to the principle of interference, the observable Poynting vector is given by the incoherent vector sum of its components in the forward and reverse components, and thus it is impermissible to express the near-zone irradiance of the field as the squared magnitudes of scalar wave functions.
 
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