From Citizendium, the Citizens' Compendium
- See also changes related to Electromagnetism, or pages that link to Electromagnetism or to this page or whose text .
- Capacitance : Add brief definition or description
- Displacement current : Time derivative of the electric displacement D; Maxwell's correction to Ampère's law.
- Electricity : The flow or presence of electric charge; the flow of electricity is an important carrier of energy.
- Electrodynamics : Add brief definition or description
- Electromagnetic field : Add brief definition or description
- Electromagnetic induction : Electromotive force induced by a varying magnetic field; described by Faraday's law of induction.
- Electromagnetic radiation : a collection of electromagnetic waves, usually of different wavelengths.
- Electromagnetic wave : A change, periodic in space and time, of an electric field E(r,t) and a magnetic field B(r,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons.
- Electron : Elementary particle that carries a negative elementary charge −e and has mass 9.109 382 91 × 10−31 kg.
- Electrostatics : Add brief definition or description
- Elementary charge : Charge of electron (negative) and proton (positive); before discovery of the quark thought to be the smallest possible electric charge, written , value 1.602 176 53(14) × 10−19 C
- Gaussian surface : Add brief definition or description
- Lorentz force : Force on an electrically charged particle that moves through a magnetic and an electric field.
- Magnetism : Property of attracting iron.
- Optics : A field of scientific, technological, and engineering study and application concerned with understanding light, — typically in the visible, ultraviolet, and infrared ranges of the electromagnetic spectrum — and harnessing it for useful tasks.
Electromagnetism in materials
- Clausius-Mossotti relation : connects the relative permittivity εr of a dielectric to the polarizability α of the atoms or molecules constituting the dielectric.
- Dielectric : an insulating, but polarizable, material that can be solid, liquid or gas; its important characterizing property is the relative permittivity (aka dielectric constant).
- Electric displacement : a vector field D in a dielectric; D is proportional to the outer electric field E.
- Electric multipole : Add brief definition or description
- Electrical conductivity : Add brief definition or description
- Ohm's law : A law which states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.
- Electrical resistance : Add brief definition or description
- Electric susceptibility : Add brief definition or description
- Lorentz-Lorenz relation : An equation describing the relation between the density and index of refraction of a dielectric.
- Polarizability : The ease by which a charge-distribution polarizes; describes the amount of charge separation caused by an electric field.
- Relative permittivity : A factor describing the polarizability of a material or medium as a proportionality between an electric displacement and an electric field in a dielectric.
Laws and equations
- Ampere's equation : An expression for the magnetic force between two electric current-carrying wire segments.
- Ampere's law : The integral of a magnetic field over a closed path is equal to the conduction current through the surface bounded by the path.
- Ampere's rule : Is a right-hand rule for the direction of deviation of a compass needle caused by the presence of a straight, electric-current carrying, wire.
- Biot-Savart law : Gives the magnetic field at some distance of an electric current-carrying wire.
- Coulomb's law : An inverse-square distance law, like Newton's gravitational law, describing the forces acting between electric point charges; also valid for the force between magnetic poles.
- Coulomb's law (magnetic) : An inverse-square law for the force between two magnetic monopoles.
- Faraday's law (electromagnetism) : States that a change in magnetic flux generates an electromotive force (EMF).
- Gauss' law (electrostatics) : Relates the surface integral of the electric displacement through a closed surface to the electric charge enveloped by the closed surface.
- Gauss' law (magnetism) : States that the total magnetic flux through a closed surface is zero; this means that magnetic monopoles do not exist.
- Lenz' law : States that a change in magnetic flux gives an induced current that opposes this change.
- Maxwell equations : Mathematical equations describing the interrelationship between electric and magnetic fields; dependence of the fields on electric charge- and current- densities.
- SI : Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela.
- Ampere (unit) : Unit of electric current; symbol A; one of the seven SI base units.
- Coulomb (unit) : SI unit of electric charge; symbol C; 1 C = 1 A⋅s.
- Volt : SI unit of electrical potential; symbol V; 1 V = 1 W/A = 1 J/C.
- Watt (unit) : SI unit of power; symbol W; 1 W = 1 J/s = 1 A⋅V
- Weber (unit) : SI unit of magnetic flux; symbol Wb; 1 Wb = 1 V⋅s.
- Tesla (unit) : SI unit for magnetic flux density B; symbol T; 1 T = 1 Wb/m2.
- Henry (unit) : SI unit of inductance; symbol H; 1 H = 1 Wb/A.
- Farad : SI unit of capacitance; symbol F: 1 F = 1 C/V
- Gaussian units : A centimeter-gram-second system of units often used in electrodynamics and special relativity. (and other EM Units)
- Abampere : Unit of electric current in the cgs-emu system of units; symbol abA; 1 abA = 10 A.
- Statampere : Electric current in the Gaussian system of units; symbol statA; 1 statA = 1 A/(10⋅c); c is the speed of light in m/s.
- Abcoulomb : Unit of electric charge in cgs-emu system of units; symbol abC; 1 abC = 10 C.
- Statcoulomb : Unit of electric charge in cgs-esu units: 1 statC = C/(10⋅c), with c the speed of light in m/s.
- Maxwell (unit) : Gaussian unit of magnetic flux; symbol Mx; 1 Mx = 1 abV⋅s = 10−8 Wb.
- Oersted (unit) : Unit of magnetic-field strength |H| in the Gaussian system of units; symbol Oe; 1 Oe = 1000/4π A⋅turn/m.
- Abvolt : Unit of voltage difference in the cgs-emu system of units; symbol abV; 1 abV = 1 erg/(s⋅abA) = 10−8 V.
- Statvolt : Unit of electric voltage; symbol statV; 1 statV = 10−6×c volt; c speed of light in m/s.
- Gauss (unit) : Gaussian unit of magnetic flux density B; symbol G; 1 G = 1 Mx/cm2 = 10 000 T.
- Electronvolt : Unit of energy; 1 eV = 1.602 176 487 × 10−19 joule
- André-Marie Ampère : (Lyons 20 January, 1775 – Marseilles 10 June, 1836) French physicist and mathematician best known for his work in electricity and magnetism.
- Jean-Baptiste Biot : (Paris 1774 – Paris 1862) French physicist, mathematician, astronomer, and chemist best known for the Biot-Savart law.
- Charles-Augustin de Coulomb : (Angoulême June 14, 1736 – Paris August 23, 1806) French physicist known for formulating a law for the force between two electrically charged bodies.
- Michael Faraday : (1791 – 1867) Was an English physicist and chemist whose best known work was on the closely connected phenomena of electricity and magnetism; his discoveries lead to the electrification of industrial societies.
- Carl Friedrich Gauss : German mathematician, who was one of the most influential figures in the history of mathematics and mathematical physics (1777 – 1855).
- Hendrik Antoon Lorentz : Dutch theoretical physicist (1853 - 1928)
- James Clerk Maxwell : (1831 – 1879) Scottish physicist best known for his formulation of electromagnetic theory and the statistical theory of gases.
- Hans Christian Oersted : (Rudkøbing, August 14, 1777 – Copenhagen, March 9, 1851) Danish physicist and chemist best known for his discovery of the influence of an electric current on the orientation of a compass needle.
- Felix Savart : (Mézières 30 June 1791 – Paris 16 March 1841) French physicist, known for the Biot-Savart law.
- Wilhelm Eduard Weber : (Wittenberg October 24, 1804 – Göttingen June 23, 1891) German physicist known for his work in magnetism and on electromagnetic units.
- Acoustics : The study of sound.
- Aerodynamics : Add brief definition or description
- Astrophysics : Hybrid of Physics and Astronomy that attempts to explain the physical workings of the celestial objects and phenomena.
- Classical mechanics : The science of mechanics, which is concerned with the set of physical laws governing and mathematically describing the motions of bodies and aggregates of bodies geometrically distributed within a certain boundary under the action of a system of forces.
- Condensed matter physics : Add brief definition or description
- Dynamics : Add brief definition or description
- Hydrodynamics : Add brief definition or description
- Kinematics : The quantitative description of the trajectory of a system.
- Mathematical physics : Add brief definition or description
- Mechanics : In physics, all theories explaining the behaviour of matter.
- Particle physcis : Add brief definition or description
- Quantum mechanics : An important branch of physics dealing with the behavior of matter and energy at very small scales.
- Relativity : Add brief definition or description
- Statics : Add brief definition or description
- Statistical mechanics : Add brief definition or description
- Theory of relativity : Add brief definition or description
- Thermodynamics : The statistical description of the properties of molecular systems