Poynting Vector


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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.

Poynting Vector

 

the vector of the flux density of electromagnetic energy; named after the English physicist J. H. Poynting (1852–1914).

The magnitude of the Poynting vector is equal to the energy transferred per unit time through a unit of surface perpendicular to the direction of propagation of the electromagnetic energy, that is, to the direction of the Poynting vector. In the absolute (Gaussian) system of units, Π = (e/π)[EH], where [EH] is the vector product of the intensities of the electric flux E and magnetic field H and c is the speed of light in a vacuum; in the International System, Π = [EH]. The flow of the Poynting vector through a closed surface bounding a system of charged particles gives the value of the energy lost by the system per unit time as a result of the emission of electromagnetic waves. The momentum density of an electromagnetic field g is expressed in terms of the Poynting vector:

G. IA. MIAKISHEV

References in periodicals archive ?
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This choice can be expressed by means of the Poynting vector of (E, H) evaluated at [c.
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physicist John Henry Poynting, developer of the Poynting Vector and the Poynting Theorem of energy conservation for electric and magnetic fields
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The Poynting vector S, which is the energy current density of the electromagnetic wave, is given by
The time-averaged Poynting vector in the indefinite medium is written as:
In these materials the direction of Poynting vector [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII.