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# Topic: Electric displacement field

###### In the News (Fri 14 Jun 19)

 PowerPedia:Electric field - PESWiki The electric field or electric field intensity is a vector quantity, and the electric field strength is the field strength magnitude of this vector. Electric fields exist around all charges; the direction of field lines at a point is defined by the direction of the electric force exerted on a positive test charge placed at that point. In the dynamic case the electric field is accompanied by a magnetic field (if charges producing electric field move with constant velocity), or by electromagnetic field (when charges move with acceleration). peswiki.com /index.php/PowerPedia:Electric_field   (996 words)

 COULOMB'S LAW AND ELECTRIC FIELDS That is, the net electric field at a point due to several charges is the vector sum of the electric fields due to individual charges. Electric field of magnitude 1000 N/C is directed horizontally along positive x-axis in a region of empty space. The electric field near the surface of the earth at a certain place is 140 N/C directed vertically downward and the acceleration due to gravity is 9.8 m/s2. www2.potsdam.edu /islamma/Electricfield_Short.htm   (1413 words)

 Electric displacement field - Wikipedia, the free encyclopedia In physics, the electric displacement field or electric flux density is a vector-valued field "D" stands for "displacement," as in the related concept of displacement current in dielectrics. In SI units, the charge density on the plates is equal to the value of the D field between the plates. en.wikipedia.org /wiki/Electric_displacement_field   (364 words)

 An Antenna with Anomalous Radiation Properties If the field medium had a natural oscillation frequency equal to that at which the antenna is excited, then the energy deployment could involve electric displacement with energy transferring at each point in space between the electric field and the kinetic energy of the displacement rate. Electric energy need not then be fed into the reacting magnetic field system and the oscillation of the electric field is sustained by its own displacement motion. Indeed, there is a counter-displacement which offsets the electric field condition and adapts to the frequency of the signal in transit so as always to be in resonance at a level set by the energy density of the wave. www.ok1rr.com /view.php?cisloclanku=2004122513   (6739 words)

 United States Patent: 5,155,495 The electric and magnetic fields are excited by power from the same source with phases so that in an interaction region of the field between a pair of the metal elements there is E.times.H synchronism and a radiation Poynting vector having rotational E and H fields to transduce the electromagnetic field. Thus the field H is in synchronism with the current causing it, that is the magnetic field is in phase with the current. A widespread electric field E is created in arcs from the top plate to the lower plate and produces a cross-product with the magnetic field H rotating in the directions indicated and thus synthesises intense Poynting vectors S which radiate outwards in broad azimuthal angles to space. www.rexresearch.com /xfldant/xfldant.htm   (5245 words)

 Electric Fields The electrical field force acts between two charges, in the same way that the gravitational field force acts between two masses. However, electric field E is a little bit different from gravitational field g. because the electric field force is inversely proportional to the square of its distance. library.thinkquest.org /10796/ch12/ch12.htm   (762 words)

 Dielectric Displacement Displacement current does not involve the motion of charges (current flow), but involves the formation of electric dipoles which create an effect similar to the movement of charges. Once the electric field was "transported" it took on a life of its' own. The electric field gave rise to a magnetic field, and vice versa, and the thing (That some call a photon, and I call a cycle.) propagated, or existed in some kind of limbo, until it was absorbed into another physical system that possessed charge. home.earthlink.net /~tdp/d.html   (642 words)

 Electric Field and Electric Potential Overbeck Electric Field Apparatus with a probe, a two-point board and a parallel-plate board, multimeter used as a galvanometer, 2 sheets of standard paper, power supply, analog voltmeter, hook-up wire. The strength or intensity of the electric field can be described graphically through the density of electric lines of force: the electric field is strongest where the lines appear closest together. The predicted field bows outward at the ends (called edge effects); however the more important predictions are that, within the central region between the plates, the electric field has a constant magnitude and is directed perpendicular to the plates from the positive to the negative plate. www.physics.smu.edu /~scalise/emmanual/field/lab.html   (1784 words)

 Electric displacement field biography .ms   (Site not responding. Last check: 2007-10-13) In physics, the electric displacement field is a vector-valued field that appears in Maxwell's equations and that generalizes the electric field. The electric displacement field is sometimes known as the "macroscopic electric field," in contrast to the electric field E, which is analagously the "microscopic electric field." The difference is that the macroscopic field "averages out" the jumble of electric fields from charged particles that make up otherwise electrically neutral material. www.biography.ms /Electric_displacement_field.html   (71 words)

 PlanetPhysics: Electric Field of a Charged Disk   (Site not responding. Last check: 2007-10-13) The Electric Field of a charged disk can teach us important concepts that you will see over and over in physics: superposition, cylindrical coordinates and non-constant basis vectors. "Electric Field of a Charged Disk" is owned by bloftin. This is version 8 of Electric Field of a Charged Disk, born on 2006-09-22, modified 2006-10-12. planetphysics.org /encyclopedia/ElectricFieldOfAChargedDisk.html   (331 words)

 Electric Fields, Electric Potentential, and Capacitors The electric field is deined as the force on a test charge with the test charge being so small that it approaches zero. Electric potential can be easier to use than electric fields because it is a scalar quantity rather than a vector quantity. In a nonuniform field (such as produced by a point charge), the electric field ina given direction at any point in space is equal to the rate at which the electric potential changes over distance in that direction. www.pschweigerphysics.com /field.html   (3513 words)

 Phys 152 - The Field of an Electric Dipole - Spring 2007 Phys 152 - The Field of an Electric Dipole - Spring 2007 In this lab you will measure the electric field around two oppositely charged electrodes (an electric dipole) at enough points to map the field. There is an electric field caused by these charges, which pulls on the electrons in the (conducting) carbon paper, causing them to move. it.stlawu.edu /~physics/labs/152_lab/html/efield.shtml   (538 words)

 More on Electric Field In physics, an electric field or E-field is an effect produced by an electric charge that exerts a force on charged objects in its vicinity. Electric fields are composed of photons and contain electrical energy with energy density proportional to the square of the field intensity. The electric field is equal to minus the gradient of the electric potential. www.artilifes.com /electric-field.htm   (811 words)

 Unified Field Theory Eq 14 is the Expression for the Electric Field. Eq 31 is the Dual of the Electric field displacement vector. This M-Field term is the field component that is responsible for the 'Frame dragging' phenomenon in General Relativity. www-personal.umich.edu /~reginald/uft.html   (1319 words)

 New Aspects of Atmospheric and Space Electricity - Atmospheric and Space Electricity [AE] In the case of earthquakes the atmosphere electricity modification is ascribed to the radon ionization and the effects are calculated within the frame of the seismo-ionosphere coupling model. Unipolar induction field E is given by E= -(wXr)XB using magnetic moment M of magnetized sphere at angular velocity w in a conducting medium (plasma). Electric fields by unipolar induction is shown in Fig.2. www.agu.org /meetings/sm05/sm05-sessions/sm05_AE11B.html   (2561 words)

 Maxwell's Equations The electromagnetic field equations have an intimate link with special relativity: the magnetic field equations can be derived from consideration of the transformation of the electric field equations under relativistic transformations at low velocities. This equation is related to the magnetic field's structure because it states that given any volume element, the net magnitude of the vector components that point outward from the surface must be equal to the net magnitude of the vector components that point inward. Another way of putting it is that the field lines cannot originate from somewhere; attempting to follow the lines backwards to their source or forward to their terminus ultimately leads back to the starting position. www.rare-earth-magnets.com /magnet_university/maxwells_equations.htm   (930 words)

 Electric Field Plotter An excellent tool for visualizing electric field and equipotential lines, Electric Field Plotter allows you to place up to nine point charges of any size on a plane. Then, after a quick click on a charge, the electric field lines emanating are clearly displayed. field dependence of a dipole is easily observed. webassign.net /pasnew/electric_field_plotter/efp.html   (341 words)

 What is the physical explanation of the fact, that the electric field is zero inside a conductor? In a conductor, say a metal wire, the charge carriers (electrons) are able to move under the influence of even a tiny electric field. At any point when there is an electric field within the conductor, positive charges (or lack of negative charges) that are entirely free to move will move in the direction of the electric field, and negative charges are entirely free to move opposite the direction of the electric field. If there is any field lines that are slanted, the tangential components (the components parallel to the surface) will cause lateral motion of the charges until the resulting secondary displacement field will counter the original field. www.physlink.com /Education/AskExperts/ae676.cfm   (659 words)

 Assessment of the Undergraduate Degrees in Physics Kansas State University Draft prepared by Dean Zollman 9 Electricity and Magnetism: The mathematical level of this course should require the use of field operators and vector integral theorems. The treatment of electrostatics should encompass Coulomb's law; the electrostatic field and potential; the Laplace and Poisson equations; electric dipoles; multipole expansions of potentials; electrostatic energy and force; capacitance; polarization; dielectrics; and the electric displacement field. The schedule should be a blend of classic experiments illustrating concepts from electricity and magnetism and quantum physics (the Franck-Hertz experiment, Zeeman effect with ions, measurement of the speed of light, etc.) as well as experiments designed to convey the flavor of contemporary experimental physics. www.phys.ksu.edu /personal/dzollman/dh/physics_assess.htm   (1948 words)

 The Electromagnetic Field   (Site not responding. Last check: 2007-10-13) The evolution of a mathematical description of the electric and magnetic forces and induction phenomena associated with electric charge and current is a fascinating chapter in the history of electromagnetic field theory. Electric and magnetic observables, which describe the magnitude and direction of force and induction phenomena in a region of space-time, form the essence of the electro­magnetic field. Fields of electric and magnetic currents (concept of duality of currents). rama.poly.edu /~marc/electmag.htm   (310 words)

 Wikinfo | Maxwell's equations Maxwell's equations provided the basis for the unification of electric field and magnetic field, the electromagnetic description of light, and ultimately, Theodor Kaluza's unification (Kaluza-Klein theory) of electromagnetism with Albert Einstein's theory of relativity. In the late 19th century, because of the appearance of a velocity (c=(ε0μ0)-1/2) in the equations, Maxwell's equations were only thought to express electromagnetism in the rest frame of the Luminiferous aether (the postulated medium for light, whose interpretation was considerably debated). Now, the electric and magnetic fields are jointly described by a 2-form in a 4-dimensional spacetime manifold which is usually called F. wikinfo.org /wiki.php?title=Maxwell's_equations   (1836 words)

 COULOMB'S LAW AND ELECTRIC FIELDS The force exerted by electric charge is described by the Coulomb's law of force. C. Calculate the ratio of the electric force and the force of gravity between two electrons. The electric field near the surface of the earth at a certain place is 140 N/C directed vertically downward and the acceleration due to gravity is 9.8 m/s www2.potsdam.edu /islamma/Phys305_Electricfield1.htm   (1297 words)

 More on Maxwell's Equations Furthermore, Maxwell showed that the four equations, with his correction, predict waves of oscillating electric and magnetic fields that travel through empty space at a speed that could be predicted from simple electrical experiments—using the data available at the time, Maxwell obtained a velocity of 310,740,000 m/s. where ρ is the free electric charge density (in units of C/m3), not including dipole charges bound in a material, and \mathbf{D} is the electric displacement field (in units of C/m2). In some types of motors/generators, the field circuit is mounted on the rotor and the armature circuit is mounted on the stator, but other types of motors/generators employ the reverse configuration. www.artilifes.com /maxwells-equations.htm   (2739 words)

 Displacement Current The larger the electric field, the more the atoms were stretched, and when the electric field was removed, the atoms snapped back to their original state, giving up the energy that was stored in them. When electric energy was stored in space, Maxwell took this to mean that the atoms of the ether became stretched, just like the atoms in paper or oil. This must be so because when an atom becomes more stretched by the increasing electric field, its positive charge moves in the direction of the applied electric field while its negative charge moves in the opposite direction. maxwell.byu.edu /~spencerr/websumm122/node72.html   (551 words)

 Physics Level 2 Syllabi - School of Physics, The University of New South Wales, Sydney Australia Curl-less fields and electric potential, interconnecting relationships between electric potential, electric field and charge density. Electrical characteristics of nerves, cable properties, electrical and ionic transients, Hodgkin-Huxley equations, comparison of myelinated and un-myelinated nerves. Electrical activity of the heart, electrocardiography, electrical activity in the brain, electroencephalography. www.phys.unsw.edu.au /COURSES/SYLLABI/2nd_year_syllabi.html   (1942 words)

 Displacement   (Site not responding. Last check: 2007-10-13) '''Displacement''' can have one of several meanings: *Displacement (distance), a physical quantity in kinematics; *Particle displacement, acoustics of sound in air. *Displacement (fluid), a different physical quantity, used in fluid mechanics and navigation; used as a measure of a ship's size; *Engine displacement, a property of an internal combustion engine; *Displacement (psychology), and *Displacement (fencing). Tom turned from the electric locomotive to see Ned staring train crew of the side-swiped accommodation train. displacement.kiwiki.homeip.net   (213 words)

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