Poynting Vector

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Poynting vector

[′pȯint·iŋ ‚vek·tər]
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:


References in periodicals archive ?
The linear momentum density is given by the Poynting vector E x B and the angular momentum is the cross product of the Poynting vector with the position vector.
This choice can be expressed by means of the Poynting vector of (E, H) evaluated at [c.
To this end, let us consider the EM field distribution in the periodic structure and the imaginary part of the Poynting vector.
physicist John Henry Poynting, developer of the Poynting Vector and the Poynting Theorem of energy conservation for electric and magnetic fields
Find the properties for the field lines of the Poynting vector field [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII.
In the surrounding medium the time-averaged Poynting vector corresponding to [w.
The radiation field from a transmitting antenna is characterized by the complex Poynting vector E X H[degrees] in which E is the electric field and H is the magnetic field.
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.
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.