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{{short description|Medium through which electromagnetic waves propagate}} ...[[Permeability (electromagnetism)|permeability]] of the medium define how electromagnetic waves propagate in it. ...

Name = Electromagnetic therapy | synonyms = Electromagnetic field therapy| ...

{{Short description|Intensity of electromagnetic radiation}} ...ensity|ionizing radiation|Radiation flux|other measures of electromagnetic radiation|Light intensity (disambiguation)}} ...

{{Short description|Propagation delay of EM radiation (light)}} In [[electromagnetism]], [[electromagnetic waves]] in [[vacuum]] travel at the [[speed of light]] ''c'', according to ...

...ron models a distribution of charges can however be accelerated so that no radiation is emitted.<ref name="Pearle 1978">{{cite journal | title = On the radiation from point charges ...

...t extracts a particular signal from all of the [[electromagnetic radiation|electromagnetic waves]] present. Detection is usually based on the [[frequency]] of the [[ ...

...henomena are a somewhat arbitrary division of [[electromagnetic phenomenon|electromagnetic phenomena]]. *[[Electromagnetic induction]] &mdash; Production of a voltage by a time-varying magnetic flux ...

...t3=N. I.|title=Multipole expansion in classic and quantum field theory and radiation|journal=Soviet Journal of Particles and Nuclei|volume=5|issue=3|pages=318–3 ...idal multipoles, however, became possible only with advances in artificial electromagnetic materials ([[metamaterial]]s),<ref>{{cite journal |last1=Papasimakis|first1 ...

.... Because of the natural radiation of the hot atmosphere, the intensity of radiation is different from the transmitted part.]] ...iveness in transmitting [[radiant energy]]. It is the fraction of incident electromagnetic [[Power (physics)|power]] that is transmitted through a sample, in contrast ...

{{distinguish|text=[[Radiation flux]]}} *{{math|''Q''_e}} is the [[radiant energy]] flux of the [[Electromagnetic field|field]] out of a [[closed surface]] {{math|&Sigma;}}; ...

...the potential formulation]], then substituting in the definitions of the [[electromagnetic potential]]s themselves: ...Ch28-S1-p10 The Feynman Lectures on Physics Vol. I Ch. 28: Electromagnetic Radiation]</ref> The formula provides a natural generalization of the [[Coulomb's law ...

...and surface currents are chosen to enforce the [[Interface conditions for electromagnetic fields|boundary conditions]].]] ...rinciple]], it is often used to simplify the analysis of [[Electromagnetic radiation|radiating]] structures such as [[Antenna (radio)|antennas]]. ...

...Intensity (physics)|intensity]] of [[electromagnetic waves|electromagnetic radiation]] can be expressed in W/m². An example of such a quantity is the As an electromagnetic wave travels through space, energy is transferred from the source to other ...

..., mass attenuation coefficients can be defined for other [[electromagnetic radiation]] (such as [[X-ray]]s), [[sound]], or any other beam that can be attenuated ...e beam will lose intensity to two processes: [[absorption (electromagnetic radiation)|absorption]] and [[scattering]]. ...

...refore, a [[classical field theory]]. The theory provides a description of electromagnetic phenomena whenever the relevant [[length scale]]s and field strengths are l ...out of [[Michael Faraday]]'s experiments suggesting the existence of an [[electromagnetic field]] and [[James Clerk Maxwell]]'s use of [[differential equation]]s to ...

...)|waveguide]], [[Antenna (radio)|antenna]] and [[Electromagnetic radiation|electromagnetic field]] principles to the design and application of devices that produce or ...area by an electromagnetic field or to provide specified sensitivity to an electromagnetic field impinging on the antenna. ...

{{for|"attenuation coefficient" as it applies to electromagnetic theory and telecommunications|Attenuation constant}} ...diation as transmitted rather than attenuated, and is more applicable to [[radiation shielding]]. ...

...the only nongravitational mass–energy present is the field energy of an [[electromagnetic field]], which must satisfy the (curved-spacetime) ''source-free'' [[Maxwel ...o specify an electromagnetic field by defining an [[electromagnetic tensor|electromagnetic field tensor]] <math>F_{ab}</math> on our Lorentzian manifold. To be class ...

...t]]s, [[hysteresis]],<ref name="PL"/> unwanted [[electromagnetic radiation|radiation]], [[dielectric loss]], [[corona discharge]], and other effects. There are ...

...a [[General relativity|relativistic]] [[vector function]] from which the [[electromagnetic field]] can be derived. It combines both an [[electric scalar potential]] a ...ial. While both the scalar and vector potential depend upon the frame, the electromagnetic four-potential is [[Lorentz covariance|Lorentz covariant]]. ...