
	Where results make sense

Topic: Poynting vector

Related Topics

Poynting flux

Poynting theorem

Magnetic field

Flux

Wave

Cross product

Electromagnetic wave

Permittivity

Energy

Oliver Heaviside

Refractive index

Tensor

James Clerk Maxwell

Heinrich Rudolf Hertz

Manhattan cocktail

In the News (Thu 17 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Relativity Revisited
		The Poynting vector’s direction is perpendicular to the E x B plane.
		He observes that the E and B fields are parallel with the x-y plane and therefore that the Poynting vector is coaxial with the z-axis.
		Assume that the premise of constant speed of light c for all inertial reference frames is true, and that the pulse is traveling along its path at c, the speed of light.
	wbabin.net /physics/Relativity.htm (1251 words)

	Tesla Vs. Poynting Waves, a letter of discussion.
		Because the wave on a resonant dipole is a standing wave, and the V and I nodes are 90 degrees apart in a standing wave, due to the mechanisms in reflection back from the ends of the antenna, etc.
		The Poynting vector equation is S = (E X B)/2 uo where uo is the permeability of free space.
		Of course, he has never made it unambiguously clear as to what exactly is zeroed----the E and B fields only, or also the Poynting vector---- and this is further complicated by the fact that he does not believe in the transverse wave in vacuum--- he insists on longitudinal waves ala Tesla.
	www.electrogravity.com /index3.html (1741 words)

	The Poynting vector, power transmission, and the CFA.
		Yet there is a local elemental Poynting vector, which, if we interpret it as a local power flow, has no basis in the Physics of the situation.
		But once they are static, the Poynting theorem tells us that it is the divergence of the Poynting vector which is zero over any volume of space where the static fields exist, providing that there are no sources or sinks of energy inside the volume.
		The solution to this conundrum is to consider the integrated Poynting vector only over an entire closed surface in 3-d space.
	personal.ee.surrey.ac.uk /Personal/D.Jefferies/poynting.html (3085 words)

	IAP - Measuring the acoustic energy flow (Site not responding. Last check: )
		The existing theory regarding the acoustic Poynting vector in the free surface of a structure which up to now has only been established for the case of isotropic structures, was generalized to non-isotropic structures.
		It was shown that, in this general case, the measurement of the acoustic Poynting vector in the surface can be reduced to a measurement of the three in-plane strain and the two in-plane velocity components.
		Based on this formulation, a sensor head concept for the determination of the acoustic Poynting vector, using multipoint optical in-plane displacement measurement was developed.
	www.iap.tuwien.ac.at /www/sensors/poynting.html (261 words)

	Electromagnetic Waves
		The magnetic field B is perpendicular to the electric field E in the orientation where the vector product E x B is in the direction of the propagation of the wave.
		This expression is a vector product, and since the magnetic field is perpendicular to the electric field, the magnitude can be written
		The rate of energy transport S is perpendicular to both E and B and in the direction of propagation of the wave.
	hyperphysics.phy-astr.gsu.edu /hbase/waves/emwv.html (256 words)

	Poynting Vector
		You are here: Home » Content » Poynting Vector
		If you are using Microsoft Internet Explorer 6 or above, please install the required MathPlayer plugin.
		Now we make the reasonable assumption that the energy flows in the direction of the wave, ie.
	cnx.org /content/m12890/latest (164 words)

	Grand Unification & Time - Welcome
		The vector E stands for the Electric field, the vector B stands for the Magnetic field, and the vector G stands for the Gravitational field (not a normal usage).
		The little arrows above the letters is a physics symbol for "vector" which in physics is a quantity that has both magnitude and direction.
		This gravitational field vector in my equation is different from the traditional symbols found in physics, specifically gravity, represented by the small "g" (not a vector) and the gravitational field constant represented by a plain big "G".
	www.grandunification.com (1043 words)

	The Poynting vector, power transmission, and the CFA.
		Yet there is a local elemental Poynting vector, which, if we interpret it as a local power flow, has no basis in the Physics of the situation.
		But once they are static, the Poynting theorem tells us that it is the divergence of the Poynting vector which is zero over any volume of space where the static fields exist, providing that there are no sources or sinks of energy inside the volume.
		The solution to this conundrum is to consider the integrated Poynting vector only over an entire closed surface in 3-d space.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/poynting.html (3085 words)

	Highbeam Encyclopedia - Search Results for Vector (Site not responding. Last check: )
		vector VECTOR [vector] quantity having both magnitude and direction; it may be represented by a directed line segment.
		Momentum is a vector quantity; i.e., it has both a magnitude and a direction, the direction being the same as that of the velocity vector.
		Speed is a scalar rather than a vector quantity; i.e., the speed of a body tells one how fast the body is moving but not the direction of the motion.
	www.encyclopedia.com /SearchResults.aspx?Q=Vector (665 words)

	Poynting's Vector
		Poynting vector describes the the flow of energy (Power) through a surface in terms of electric and magnetic properties.
		The Poynting vector points in the direction of propagation of a traveling electromagnetic wave.
		Poynting vector has the dimensions of power per area.
	home.earthlink.net /~tdp/poynting.html (86 words)

	Poynting, John Henry (Site not responding. Last check: )
		Poynting was born near Manchester and studied there at Owens College, and at Cambridge.
		where S is the Poynting vector, is the permeability of the medium, E is the electric field strength, B is the magnetic field strength, and is the angle between the vectors representing the electric and magnetic fields.
		Poynting also devised a method for measuring the radiation pressure from a body; his method can be used to determine the absolute temperature of celestial objects.
	cartage.org.lb /en/themes/Biographies/MainBiographies/P/Poynting/1.html (222 words)

	OPTI 501
		Vector integration: Line, surface, and volume integrals, divergence of a vector field, flux of a vector field, the divergence theorem, curl of a vector field, circulation density, Stokes theorem, uniqueness theorem.
		Electromagnetic field energy and momentum: EM field energy, Poynting vector, non-uniqueness of the Poynting vector, Lorentz force on charges, mechanical energy exchanged with charges, radiation pressure force on atoms and mirrors, expression for the EM field momentum and momentum density.
		Scalar and vector potentials: Vector and scalar potentials and their relation to the physical fields, wave equations for the potentials, nonuniqueness of potentials and gauge transformations, Lorentz gauge and Coulomb (or radiation) gauge and associated wave equations for the potentials, separation into transverse and longitudinal fields in the Coulomb gauge.
	www.optics.arizona.edu /classes/Grad/Opti_501.htm (1056 words)

	Poynting vector - Wikipedia, the free encyclopedia
		It points in the direction of energy flow and its magnitude is the power per unit area crossing a surface which is normal to it.
		For example, the Poynting vector near an ideally conducting wire is parallel to the wire axis - so electric energy is flowing in space outside of the wire.
		The Poynting vector becomes tilted toward wire for a resistive wire, indicating that energy flows from the e/m field into the wire, producing resistive Joule heating in the wire.
	en.wikipedia.org /wiki/Poynting_vector (389 words)

	Wave normal and Poynting vector calculations using the Cassini radio and plasma wave instrument
		Wave normal and Poynting vector measurements from the Cassini radio and plasma wave instrument (RPWS) are used to examine the propagation characteristics of various plasma waves during the Earth flyby on August 18, 1999.
		Using the five-channel waveform receiver (WFR), the wave normal vector is determined using the Means method for a lightning-induced whistler, equatorial chorus, and a series of low-frequency emissions observed while Cassini was in the magnetosheath.
		The wave normal vectors of these waves were primarily in one direction for each individual burst (either parallel or antiparallel to the local field) but varied in direction throughout the magnetosheath.
	www.agu.org /pubs/crossref/2001/2001JA900114.shtml (473 words)

	Poynting vector (Site not responding. Last check: )
		These images show the orientation of the Poynting vector , i.e.
		The movies show the time dependent movement of the vector E×H. In the case of an interface the sample is illuminated from the low refractive index side, i.e.
		The scalebar has a length of one wavelength, a logarithmic color scale with a range covering a factor of 1024 is used to encode either or E(t)×H(t).
	www.pc.chemie.uni-siegen.de /pci/pmfoc/infoP.html (141 words)

	Radio antenna - Patent 6025813
		Mathematically S is the vector cross product of the electric field with the magnetic field, written in terminology of vector maths: S=E.times.H. Exactly half the power is in each field, and their magnitude relationship being set by the natural space impedance Zo given by: Zo=.vertline.E.vertline./.vertline.H.vertline.
		The field vector relationships for Poynting Vector Synthesis will only be correct (both peaks synchronised) if there is arranged an appropriate phase difference of 90 degrees in the two source currents in the loops.
		The plane-wave view of the Poynting Vector is simplistic because it does not represent the inherent property of a radio wave system to enlarge, and fill space, as it travels outwards from its source as a spherical shaped wavefront.
	www.freepatentsonline.com /6025813.html (2296 words)

	Electromagnetic Waves
		Vector calculus is usually introduced to students in an electromagnetism course at intermediate undergraduate level.
		The complex Poynting vector is (c/8π)[E x H*], where the real part is ohmic dissipation, and the imaginary part is the difference between the magnetic and electric field energies (zero for a plane wave in space).
		The wave vector of the transmitted, or refracted, wave also lies in the plane of incidence, and the ratio of the sine of the angle of incidence to sine of the angle of refraction is the same as the ratio of the propagation velocities.
	www.du.edu /~jcalvert/phys/emwaves.htm (9513 words)

	ORBIT/FR - Antenna Measurement Theory Basic Antenna Concepts (Site not responding. Last check: )
		The radiation field from a transmitting antenna is characterized by the complex Poynting vector E x H* in which E is the electric field, and H is the magnetic field.
		Close to the antenna, at a distance r from the antenna, the Poynting vector is imaginary (reactive) and the fields decay more rapidly than 1/r, while farther away from the antenna the Poynting vector is real (radiating) and the fields decay as 1/r.
		Polarization is the property of the electric field vector that defines variation in direction and magnitude with time.
	www.orbitfr.com /Index.asp?ItemID=289 (834 words)

	Financial Sense Forum - Oceans of Free Energy? (Site not responding. Last check: )
		I don't see where the Poynting equations require that there is "energy flow" in the vacuum, aside from the case of an electromagnetic wave, which is what their application is. In other words, if you have an electromagnetic wave, then the Poynting equations apply, and you have energy flow.
		Suddenly (according to Poynting's equation, hence according to Maxwell's laws) div S must be non-zero in the same place(s) as the current density, and furthermore, since the magnitude of E appears on both sides, the magnitude of B must depend on the magnitude of J.
		Back on EM fluxes and propulsion for a moment (where we arrived via energy-from-the-vacuum and the Poynting Vector), there is such a thing as radiation pressure, normally thought of when light hits a surface such as a solar sail, but directional emitters of EM radiation must get pushed away from the emitted beam.
	www.financialsense.com /cgi-bin/yabb2/YaBB.pl?num=1132642104/99 (3611 words)

	The Tom Bearden Website
		Poynting never even considered anything but the DIVERTED component, which IS NOT the energy flow per se, but the diverged or collected or diverted energy flow.
		Poynting, on the other hand, holds a different view, representing the transfer as nearly perpendicular to a wire, i.e., with a slight departure from the vertical.
		The field part (the E and H part) of the Poynting theory is thus "hookered" by substitution of the effect (the diverged energy) for the cause (the entire flow of energy comprising the field prior to any divergence at all.) It's a real mess that ought to be strongly cleaned up.
	www.cheniere.org /correspondence/110201.htm (2992 words)

	longitudinal waves notion
		But it is not true understanding of the nature for this wave since the energy density is described here by Poynting vector P (that is known in Russia also as Umov vector) and this vector direction is perpendicular both to E and H.
		In other words, the reason for motion of photon is energy translation in Poynting vector direction and the wave is longitudinal one.
		Poynting vector for Hertz electromagnetic wave is uni-directional pulse function and by this description this kind of wave should be named as pulsing longitudinal wave.
	www.galactic-server.com /radio/zwp.html (817 words)

	Energy (Site not responding. Last check: )
		Poynting's theorem, being a consequence of the general equations, doesn't add anything to them.
		Poynting's theorem, in demanding only the possibility of the transformation of an integral of volume (already partly arbitrary) to an integral of surface, expresses a lot less.
		Poynting's theorem expresses the law of energy only when we replace the fields with their representations based on retarded potentials, a restriction which removes a lot of its elegance and scope.
	www.datasync.com /~rsf1/crit/1908f.htm (1115 words)

	Behaviour of the Poynting vector in uniaxial absorbent media
		We verify that when light is incident on the interface, the direction of the Poynting vectors corresponding to the refracted ordinary and extraordinary waves varies with time as in the case of the isotropic absorbing media.
		The centre of the ellipses is given by the temporal average of the ordinary and extraordinary Poynting vectors respectively.
		Moreover, the time-averaged Poynting vector is never contained in the incidence plane, neither in the extraordinary or in the ordinary case.
	stacks.iop.org /0963-9659/3/931 (300 words)

	Poynting vector fields in a perpendicularly ensonified fluid loaded elastic cylinder (Site not responding. Last check: )
		The instantaneous Poynting vector field can be used to follow the propagation of elastodynamic waves in the cylinder.
		The complex Poynting vector field, which is a time-averaged representation of the energy flow, is shown in terms of separate real and imaginary parts.
		The patterns formed by the Poynting vector field, in both its instantaneous and the real and imaginary parts of the complex form, can be identified with the various modes of the ensonified cylinder and used to explain the physical processes going on inside the ensonified cylinder.
	flux.aps.org /meetings/YR99/CENT99/abs/S7835013.html (211 words)

	On Poynting Vector and Photon Velocity Directions
		The direction of radiant energy flux can be expressed as the Poynting vector’s direction and/or as photon velocity direction.
		For example, suppose that in inertial frame K a plane wave propagates in the negative y-direction.
		To the extent electric interactions in divergent fields are modeled as exchanges of "virtual" photons, this result may imply a fundamental difference between real light photons and virtual photons.
	www.maxwellsociety.net /PhysicsCorner/Transformations/PoyntingPhoton.html (382 words)

	[No title]
		It follows from these last four equations that the Poynting vector inside the circular cylindrical conductor, in the surrounding space, and in the disk-shaped electrode is
		The first integral on the right is zero because the curl of a vector is divergence free and a field with no divergence has zero flux through a closed surface.
		By contrast with the Poynting flux density, this vector field is zero in the free space region.
	web.mit.edu /6.013_book/www/chapter11/11.3.html (1533 words)

	Flux - Wikipedia, the free encyclopedia
		Using this definition, the flux of the Poynting vector over a specified surface is the rate at which electromagnetic energy flows through that surface.
		Stokes theorem states that the flux of the curl of a vector field is the line integral of the vector field over this boundary.
		The flux of the Poynting vector through a surface is the electromagnetic power, or energy per unit time, passing through that surface.
	en.wikipedia.org /wiki/Flux (1576 words)

	[No title]
		The vector fields made of vectors, v1, v2 and v3, can be applied to gravitational fields, electric fields, and magnetic fields.
		It was shown that the potential gradient of an electric field was analogous to the gravitation potential, and it could clearly be seen that the Laplacian of a gravitational field was practically identical to the Laplacian of an Electric field except for the scalar functions.
		The rank of the independent vectors in this relation of the G field and the EM field is a 6th dimensional vector field.
	members.aol.com /OBrilliantOne/suhsft2.htm (2072 words)

Try your search on: Qwika (all wikis)