Poynting in a sentence

The radiation pressure exerted by an electromagnetic wave on the surface of a target is given by : Static fields Poynting vector in a static field, where E is the electric field, H the magnetic field, and S the Poynting vector.

This means that adding a field to S which has zero divergence will result in a field which satisfies this required property of a Poynting vector field according to Poynting's theorem.

Additional reporting by Daniel Wainwright, William Dahlgreen, Mark Poynting and Gerry Georgieva.

Across any plane P between the battery and resistor, the Poynting flux is in the direction of the resistor.

Although there are only static electric and magnetic fields, the calculation of the Poynting vector produces a clockwise circular flow of electromagnetic energy, with no beginning or end.

Antenna (radio) An isotropic antenna is an idealized " radiating element " used as a reference ; an antenna that broadcasts power equally (calculated by the Poynting vector ) in all directions.

Classical picture In classical Maxwell electrodynamics a phase-conjugating mirror performs reversal of the Poynting vector : : which is a linear momentum density of electromagnetic field, where (in) means incident field, (out) means reflected field.

Confusingly, the Poynting vector is sometimes called the power flux, which is an example of the first usage of flux, above.

For example, the Poynting vector within the dielectric insulator of a coaxial cable is nearly parallel to the wire axis (assuming no fields outside the cable and a wavelength longer than the diameter of the cable, including DC).

In the region around the battery the Poynting vector is directed outward, indicating power flowing out of the battery into the fields; in the region around the resistor the vector is directed inward, indicating field power flowing into the resistor.

It is also possible to combine the electric displacement field D with the magnetic flux density B to get the Minkowski form of the Poynting vector, or use D and H to construct yet another version.

Once the Poynting vector enters the conductor, it is bent to a direction that is almost perpendicular to the surface. citation : 61 This is a consequence of Snell's law and the very slow speed of light inside a conductor.

Resistive dissipation If a conductor has significant resistance, then, near the surface of that conductor, the Poynting vector would be tilted toward and impinge upon the conductor.

The component of Poynting vector in the direction normal to the boundary is finite, but its time average vanishes.

The definition and computation of the speed of light in a conductor can be given. citation : 402 Inside the conductor, the Poynting vector represents energy flow from the electromagnetic field into the wire, producing resistive Joule heating in the wire.

The following quantity, still referred to as a "Poynting vector", is expressed directly in terms of the phasors as: where * denotes the complex conjugate.

The Poynting–Robertson effect applies to grain-size particles.

The Poynting vector represents the particular case of an energy flux vector for electromagnetic energy.

This directly follows from the above expression for the average Poynting vector using phasor quantities, and the fact that in a plane wave the magnetic field is equal to the electric field divided by η (and thus exactly in phase).

This is due to the fact that the extraordinary wave propagating through a birefringent crystal possesses a Poynting vector that is not parallel with the propagation vector.