Also found in: Dictionary, Medical, Wikipedia.
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
..... Click the link for more information.
; 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.
..... Click the link for more information.
); 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.
..... Click the link for more information.
, 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.
..... Click the link for more information.
, 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.
..... Click the link for more information.
, 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
..... Click the link for more information.
, 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.
..... Click the link for more information.
 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.
..... Click the link for more information.
 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 ?
The concept of circuit quantum electrodynamics, developed in superconducting quantum computing, has enabled strong light-matter coupling at microwave frequencies and has been one of the driving forces behind the advances in quantum computing.
The Quantum Vacuum: An Introduction to Quantum Electrodynamics, Academic Press, 1994.
Chapter 3 provides an excellent introduction to Feynman's approach to quantum electrodynamics and to his reformulation of quantum mechanics using the path integral.
Feynman shared the 1965 Nobel physics prize with Sin-Itiro Tomonaga and Julian Schwinger for "fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles:' Krauss here gives us useful perspective on how physicist Freeman Dyson was crucial in Feynman's career and fame.
The system is called AMPERE, short for active magnetosphere and planetary electrodynamics response experiment.
It may even turn out to be the case that one of the most well-established theories in all of physics, quantum electrodynamics, will need to be revamped to reconcile the conflicting data.
But if borne out in further experiments, the findings could challenge fundamental precepts of quantum electrodynamics, the theory of how quantum light and matter interact, say its authors.
The power source was developed at the Institute of Electrodynamics on the basis of the technical projects of experts of the Antares International Organisation.
Einstein's paper on the electrodynamics of moving bodies, for example, is described as "radiat[ing] perfection.
Jackson, Classical Electrodynamics, 2nd edition, John Wiley and Sons (1975) p.
TM4 designs and markets systems based on electrodynamics, conversion and power control components that meet the specific requirements of its clients.
Industry officials in China recently reported that Chinese Academy of Engineering (CAE) member and electrodynamics expert Chen Qingquan has expressed his belief that the development of electric vehicles (EVs), hybrid electric vehicles (HEVs) and fuel cell vehicles (FCVs) will play an important role in helping the Chinese automobile manufacturing industry compete with its counterparts in more advanced nations.