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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.


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


The study of the relations between electrical, magnetic, and mechanical phenomena.


the branch of physics concerned with the interactions between electrical and mechanical forces
References in periodicals archive ?
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
More specifically, our generalized electrodynamics allows globally bounded two-body orbits with vanishing far-fields, thus introducing bounded motions along which an atom is isolated from disturbing/being disturbed by other atoms.
Chapter 3 provides an excellent introduction to Feynman's approach to quantum electrodynamics and to his reformulation of quantum mechanics using the path integral.
Either the previously accepted measures upon which hundreds of calculations have been based are wrong, or there is a problem with the theory of quantum electrodynamics itself.
And a comely student (played by Allison Smith) from one of his classes keeps arriving, hoping to ask an important question that has nothing to do with quantum electrodynamics.
Kravcik, who is retiring after serving as president of Electrodynamics for 23 of his 34 years with the company.
Her father is Freeman Dyson, renowned in science circles for his work in quantum electrodynamics, and appreciated far beyond academia for his futurist books, the most recent being "Imagined Worlds.
The heroic labours of a small number of men overcame seemingly intractable hurdles to create a theory, Lorentz-invariant quantum electrodynamics (QED), which to this day forms the cornerstone of high-energy physics.
Chapter 4 focuses on post-Maxwellian electrodynamics.
In this way, Gell-Mann founded the study of quantum chromodynamics, on the model of quantum electrodynamics, which had proved to work so well (see 1948).
Utilizing the research of world-renowned experts, Modern Nonlinear Optics presents a dialogue between two prevailing schools of thought: one concerned with quantum optics and Abelian electrodynamics, the other with the emerging subject of non-Abelian electrodynamics and unified field theory.
The Quantum Puzzle: Critique of Quantum Theory and Electrodynamics