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Related to electrodynamics: Maxwell's equations, Classical electrodynamics


study of phenomena associated with charged bodies in motion and varying electric and magnetic fields (see chargecharge,
property of matter that gives rise to all electrical phenomena (see electricity). The basic unit of charge, usually denoted by e, is that on the proton or the electron; that on the proton is designated as positive (+e
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; electricityelectricity,
class of phenomena arising from the existence of charge. The basic unit of charge is that on the proton or electron—the proton's charge is designated as positive while the electron's is negative.
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); since a moving charge produces a magnetic fieldfield,
in physics, region throughout which a force may be exerted; examples are the gravitational, electric, and magnetic fields that surround, respectively, masses, electric charges, and magnets. The field concept was developed by M.
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, electrodynamics is concerned with effects such as magnetismmagnetism,
force of attraction or repulsion between various substances, especially those made of iron and certain other metals; ultimately it is due to the motion of electric charges.
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, electromagnetic radiationelectromagnetic radiation,
energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if the motion is changing (accelerated), then the magnetic field varies and in turn produces an electric field.
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, and electromagnetic inductioninduction,
in electricity and magnetism, common name for three distinct phenomena. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing magnetic field about the conductor and is the most important of the
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, including such practical applications as the electric generator and the electric motor. This area of electrodynamics, often known as classical electrodynamics, was first systematically explained by the physicist James Clerk Maxwell. Maxwell's equations, a set of differential equations, describe the phenomena of this area with great generality. A more recent development is quantum electrodynamics, which was formulated to explain the interaction of electromagnetic radiation with matter, to which the laws of the quantum theoryquantum theory,
modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles; the quantum theory and the theory of relativity together form the theoretical basis of modern physics.
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 apply. The physicists P. A. M. Dirac, W. Heisenberg, and W. Pauli were the pioneers in the formulation of quantum electrodynamics. When the velocities of the charged particles under consideration become comparable with the speed of light, corrections involving the theory of relativityrelativity,
physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference.
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 must be made; this branch of the theory is called relativistic electrodynamics. It is applied to phenomena involved with particle accelerators and with electron tubes that are subject to high voltages and carry heavy currents.
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The study of the relations between electrical, magnetic, and mechanical phenomena. This includes considerations of the magnetic fields produced by currents, the electromotive forces induced by changing magnetic fields, the forces on currents in magnetic fields, the propagation of electromagnetic waves, and the behavior of charged particles in electric and magnetic fields. Classical electrodynamics deals with fields and charged particles in the manner first systematically described by J. C. Maxwell, whereas quantum electrodynamics applies the principles of quantum mechanics to electrical and magnetic phenomena. Relativistic electrodynamics is concerned with the behavior of charged particles and fields when the velocities of the particles approach that of light. Cosmic electrodynamics is concerned with electromagnetic phenomena occurring on celestial bodies and in space. See Electromagnetism, Quantum electrodynamics, Relativistic electrodynamics

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.


The study of the relations between electrical, magnetic, and mechanical phenomena.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


the branch of physics concerned with the interactions between electrical and mechanical forces
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Cooperation of the NTU <<KhPI>> with the Institute of Electrodynamics of the National Academy of Sciences of Ukraine.
The program based on two above principles can be realized in nonlinear electrodynamics coupled to gravity (NED-GR) in the frame of the standard minimal coupling of gravitational and electromagnetic field, that is, without introducing some hypothetical nonminimal coupling which could be essential at the Planck energies, since in the modern string/M-theories nonlinear electrodynamics appears as low-energy effective limits [35, 36].
When [beta] [right arrow] [infinity], BI electrodynamics reduces to the standard Maxwell form; solution (14) reduces to
In the stochastic electrodynamics approach, the equation of motion of the charged particle in the zeropoint field is known as Brafford-Marshall equation [13] which is simply the Abraham-Lorentz [22] equation of motion of a charged particle of mass m and charge e and it is given by
Electrodynamics (USEI) operates a 100-acre, 54-antennae satellite Ground Station in the town of Brewster, providing critical communications to U.S.
He talks about his good fortune in getting to know Richard Feynman and his ground-breaking work: "I became a sort of an interested spectator, watching him work out his version of quantum electrodynamics...
We show that the extended fields satisfy the integral laws of classical electrodynamics inside B, i.e., Gauss's surface integral law for the electric field, Gauss's surface integral law for the magnetic field, Ampere's law and Faraday's induction law in integral form [6].
of Heidelberg, Germany) presents a textbook for students who have a reasonably complete knowledge of the material usually taught in the introductory courses on theoretical physics, among them classical mechanics, electrodynamics, quantum mechanics, and thermodynamics.
"It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment." Freeman John Dyson (1923-) is a British-born American theoretical physicist and mathematician, famous for his work in quantum electrodynamics, solid-state physics, astronomy and nuclear engineering.
And on the other hand, he shows how Feynman diagrams immediately brought with them conceptual changes in quantum electrodynamics going beyond the mere simplification of calculations.
Then, Clegg presents the work of Richard Feynman and QED (Quantum Electrodynamics).
of Manchester, Britain) have expanded the 1984 first edition in order to treat quantum chromodynamics as well as quantum electrodynamics in their short introduction to quantum field theory for beginning research students in theoretical and experimental physics.