The force that the electromagnetic field exerts on electrically charged particles, called the electromagnetic force, is one of the four fundamental forces. The other fundamental forces are the strong nuclear force (which holds atomic nuclei together), the weak nuclear force (which causes certain forms of radioactive decay), and the gravitational force. All other forces are ultimately derived from these fundamental forces. As it turns out, the electromagnetic force is the one responsible for practically all the phenomena one enc ...

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Electromagnetism, Electromagnetism - Electric and magnetic fields, Electromagnetism - The electromagnetic force, Electromagnetism - Origins of electromagnetic theory, Electromagnetism - Failures of classical electromagnetism, Electromagnetism - SI electricity units

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Electromagnetism, Electromagnetism - Electric and magnetic fields, Electromagnetism - The electromagnetic force, Electromagnetism - Origins of electromagnetic theory, Electromagnetism - Failures of classical electromagnetism, Electromagnetism - SI electricity units

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The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be rapidly manipulated over a wide range by controlling the electric current. A disadvantage is that if an electromagnet with a ferromagnetic core is turned on and off again, the core retains some residual magnetization due to hysteresis. This magnetic field can persist indefinitely. As more electricity is passed through the electromagnet ...

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Electromagnet, Electromagnet - Introduction, Electromagnet - Electromagnets and permanent magnets, Electromagnet - Devices that use electromagnets, Electromagnet - Force on ferromagnetic materials

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Classical electrodynamics (or classical electromagnetism) is a theory of electromagnetism that was developed over the course of the 19th century, most prominently by James Clerk Maxwell. It provides an excellent description of electromagnetic phenomena whenever the relevant length scales and field strengths are large enough that quantum mechanical effects are negligible (see quantum electrodynamics). Classical electromagnetism - Lorentz force. The electromagnetic field exerts the following force (oft ...

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Classical electromagnetism - Lorentz force Classical electromagnetism - The Electric Field E Classical electromagnetism - Electromagnetic waves Classical electromagnetism - General Field Equations Classical electromagnetism - Also See

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Electromagnetic radiation is a propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other and to the direction of propagation. The term electromagnetic radiation is also used as a synonym for electromagnetic waves in general, even if they are not radiating or travelling in free space. This sense includes, for example, light travelling through an optica ...

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Electromagnetic radiation - Physics
Electromagnetic radiation - Theory Electromagnetic radiation - Properties Electromagnetic radiation - Wave model Electromagnetic radiation - Particle model Electromagnetic radiation - Speed of propagation
Electromagnetic radiation - Electromagnetic spectrum
Electromagnetic radiation - Light Electromagnetic radiation - Radio waves
Electromagnetic radiation - Derivation

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The wave equation is an important partial differential equation which generally describes all kinds of waves, such as sound waves, light waves and water waves. It arises in many different fields, such as acoustics, electromagnetics, and fluid dynamics. Variations of the wave equation are also found in quantum mechanics and general relativity. Historically, the problem of a vibrating string such as that of a musical instrument was studied by Jean le Rond d'Alembert, Leonhard Euler, Daniel Bernoulli, and Joseph-Louis Lagrange. The general form of the wave equation for a scalar quantity

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Electromagnets are used in many situations where a rapidly or easily variable magnetic field is desired. Many of these applications involve deflection of charged particle beams; the cathode ray tube and mass spectrometer fall into this category. Other devices cause electromagnetic fields to interact with fields from permanent magnets and produce forces. Electromagnetic actuators take advantage of the fact that, if the core of a solenoid is displaced toward one end of the coil, a force will occur tending to push the core farther in tha ...

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Electromagnet, Electromagnet - Introduction, Electromagnet - Electromagnets and permanent magnets, Electromagnet - Devices that use electromagnets, Electromagnet - Force on ferromagnetic materials

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In electromagnetics and communications engineering, a waveguide is a physical structure that guides the propagation of electromagnetic waves. Waveguides can be constructed to carry waves over a wide portion of the electromagnetic spectrum, but are especially useful in the microwave and optical frequency ranges. Depending on the frequency, they can be constructed from either conductive or dielectric materials. Waveguides are used for transferring both power and communication signals. Waveguide - History. The ...

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Waveguide - History Waveguide - Principles of operation Waveguide - Hollow metallic waveguides Waveguide - Transmission lines Waveguide - Dielectric waveguides

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The centimetre-gram-second system (CGS) is a system of physical units. It is always the same for mechanical units, but there are several variants of electric additions. The system goes back to a proposal made in 1832 by the German mathematician Carl Friedrich Gauss and was in 1874 extended by the British physicists James Clerk Maxwell and William Thomson with a set of electromagnetic units. The sizes (order of magnitude) of many CGS units turned out to be inconvenient for practical purposes, therefore the CGS system neve ...

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Centimetre gram second system of units - Electromagnetic units

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A coil is a series of loops. Coil - General applications. A coil is made of materials, usually rigid, which can fashioned into a spiral or helical shape. Flexible materials like wire, rope, hose, or cable can also be coiled into empty loops, or wound around a central drum or spindle. Some common applications of coils include: A coil spring is the most common type of spring. A set of stairs fashioned in a coil shape, which are called spiral staircases. A Sl ...

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Coil - General applications Coil - Electromagnetic Coil - Chemistry Coil - Other uses Coil - External articles

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It is often convenient to understand the electromagnetic field in terms of two separate fields: the electric field and the magnetic field. A non-zero electric field is produced by the presence of electrically charged particles, and gives rise to the electric force; this is the force that causes static electricity and drives the flow of electric charge (electric current) in electrical conductors. The magnetic field, on the other hand, can be produced by the motion of electric charges, or electric curre ...

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Electromagnetism, Electromagnetism - Electric and magnetic fields, Electromagnetism - The electromagnetic force, Electromagnetism - Origins of electromagnetic theory, Electromagnetism - Failures of classical electromagnetism, Electromagnetism - SI electricity units

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Electromagnetic spectroscopy - Emission spectroscopy. Emission spectroscopy is the study of electromagnetic radiation spectra given off by atoms or molecules that undergo a transition to a lower energy level. Such a process is called fluorescence or, under certain conditions, phosphorescence. Generally, emission spectroscopy deals with visible light and shorter wavelengths, since fluorescence is less likely to happen with long wavelengths. See also: spontaneous emission. Examples: Fluorescence spectroscopy Flame emission spec ...

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Electromagnetic spectroscopy, Electromagnetic spectroscopy - Types of electromagnetic radiation measured, Electromagnetic spectroscopy - Types of electromagnetic spectroscopy, Electromagnetic spectroscopy - Emission spectroscopy, Electromagnetic spectroscopy - Absorption spectroscopy, Electromagnetic spectroscopy - Other techniques, Electromagnetic spectroscopy - Examples, Electromagnetic spectroscopy - The spectrum of sunlight, Electromagnetic spectroscopy - Absorption in the atmosphere

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Electrically charged particles are constantly emitting (or absorbing) photonic fluid, which is more commonly known as light. So how is light related to electromagnetic waves? Electromagnetic (E-M) waves are the undulatory movements of light, which can always be observed to be emitted by electric charges undergoing acceleration. If a charged particle is at rest, then it does not emit electromagnetic waves. Instead, it is surrounded by an electrostatic field. If a charged particle is in inertial motion, then the electrostatic field is j ...

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Electromagnetic field, Electromagnetic field - Behavior of the electromagnetic fields, Electromagnetic field - Incompressible fluids, Electromagnetic field - Source and Sinks, Electromagnetic field - The two fluids, Electromagnetic field - The vortex, Electromagnetic field - Summary, Electromagnetic field - Negative Feedback Loop, Electromagnetic field - Positive Feedback Loop, Electromagnetic field - Flaw in the velocity field interpretation, Electromagnetic field - The field as a stream of moving photons, Electromagnetic field - Light and electromagnetic waves, Electromagnetic field - The electromagnetic field as a feedback loop

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Generally, EM radiation is classified by wavelength into electrical energy, radio, microwave, infrared, the visible region we perceive as light, ultraviolet, X-rays and gamma rays. The behavior of EM radiation depends on its wavelength. Higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths. When EM radiation interacts with single atoms and molecules, its behavior depends on the amount of energy per quantum it carries. Spectroscopy can detect a much wider region of the EM spectrum than the vi ...

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Electromagnetic radiation, Electromagnetic radiation - Physics, Electromagnetic radiation - Theory, Electromagnetic radiation - Properties, Electromagnetic radiation - Wave model, Electromagnetic radiation - Particle model, Electromagnetic radiation - Speed of propagation, Electromagnetic radiation - Electromagnetic spectrum, Electromagnetic radiation - Light, Electromagnetic radiation - Radio waves, Electromagnetic radiation - Derivation

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Electromagnetic radiation - Theory. Electromagnetic waves of much lower frequency than visible light were predicted by Maxwell's equations and subsequently discovered by Heinrich Hertz. Maxwell derived a wave form of the electric and magnetic equations which made explicit the wave nature of the electric and magnetic fields. These equations displayed the symmetry of the fields. According to the theory, a time-varying electric field generates a magnetic field and vice versa. Thus, an oscillating elect ...

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Electromagnetic radiation, Electromagnetic radiation - Physics, Electromagnetic radiation - Theory, Electromagnetic radiation - Properties, Electromagnetic radiation - Wave model, Electromagnetic radiation - Particle model, Electromagnetic radiation - Speed of propagation, Electromagnetic radiation - Electromagnetic spectrum, Electromagnetic radiation - Light, Electromagnetic radiation - Radio waves, Electromagnetic radiation - Derivation

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The electromagnetic tensor is commonly written as a matrix: where E is the electric field B the magnetic field and c the speed of light. When using natural units, the speed of light is taken to equal 1. From the matrix form of the field tensor, it becomes clear that the electromagnetic tensor satisfies the following properties (Mathematical note: In this article, the abstract index notation will be used.): antisymmetry: (hence the name bivector). zero ...

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Electromagnetic tensor, Electromagnetic tensor - Details, Electromagnetic tensor - Derivation, Electromagnetic tensor - Significance of the Field Tensor, Electromagnetic tensor - The field tensor and relativity, Electromagnetic tensor - Role in Quantum Electrodynamics and Field Theory

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Electromagnetic waves as a general phenomenon were predicted by the classical laws of electricity and magnetism, known as Maxwell's equations. If you inspect Maxwell's equations without sources (charges or currents) then you will find that, along with the possibility of nothing happening, the theory will also admit nontrivial solutions of changing electric and magnetic fields. (For symbol definitions see magnetic field.) is a solution, but there might be other solutions as well. Let us employ a us ...

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Electromagnetic radiation, Electromagnetic radiation - Physics, Electromagnetic radiation - Theory, Electromagnetic radiation - Properties, Electromagnetic radiation - Wave model, Electromagnetic radiation - Particle model, Electromagnetic radiation - Speed of propagation, Electromagnetic radiation - Electromagnetic spectrum, Electromagnetic radiation - Light, Electromagnetic radiation - Radio waves, Electromagnetic radiation - Derivation

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The electric field E is defined such that, on a stationary charge: where q0 is what is known as a test charge. The size of the charge doesn't really matter, as long as it is small enough as to not influence the electric field by its mere presence. What is plain from this definition, though, is that the unit of E is N/C, or newtons per coulomb. This unit is equal to V/m (volts per meter), see below. The above definition seems a little bit circular but, in electrostatics, where charges are not moving, Coulom ...

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Classical electromagnetism, Classical electromagnetism - Lorentz force, Classical electromagnetism - The Electric Field E, Classical electromagnetism - Electromagnetic waves, Classical electromagnetism - General Field Equations, Classical electromagnetism - Also See

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Electromagnetic field - Incompressible fluids. The electric and magnetic vector fields can be thought of as being the velocities of a pair of incompressible fluids which permeate space. In the absence of charges these fluids would be at rest, so that their velocity fields would be zero. Since both fluids are incompressible, their densities do not change: it is not possible to compress magnetic or electric fluid into a smaller space. ...

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Electromagnetic field, Electromagnetic field - Behavior of the electromagnetic fields, Electromagnetic field - Incompressible fluids, Electromagnetic field - Source and Sinks, Electromagnetic field - The two fluids, Electromagnetic field - The vortex, Electromagnetic field - Summary, Electromagnetic field - Negative Feedback Loop, Electromagnetic field - Positive Feedback Loop, Electromagnetic field - Flaw in the velocity field interpretation, Electromagnetic field - The field as a stream of moving photons, Electromagnetic field - Light and electromagnetic waves, Electromagnetic field - The electromagnetic field as a feedback loop

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The electromagnetic field exerts the following force (often called the Lorentz force) on charged particles: where all boldfaced quantities are vectors: F is the force that a charge q experiences, E is the electric field at q's location, v is q's velocity, B is the strength of the magnetic field at q's position. This description of the force between charged particles, unlike Coulomb's force law, does not break down under relativity and in fact, the magnetic force is seen as part of the relativistic int ...

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Classical electromagnetism, Classical electromagnetism - Lorentz force, Classical electromagnetism - The Electric Field E, Classical electromagnetism - Electromagnetic waves, Classical electromagnetism - General Field Equations, Classical electromagnetism - Also See

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