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Electromagnetic Field | A Wisdom Archive on Electromagnetic Field |  | Electromagnetic Field A selection of articles related to Electromagnetic Field |  |
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Electromagnetic field
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| ARTICLES RELATED TO Electromagnetic Field |  |  |  | Electromagnetic Field: Encyclopedia II - List of publications in physics - Electromagnetism
List of publications in physics - A Dynamical Theory of the Electromagnetic Field.
James Clerk Maxwell
Maxwell, James Clerk, "A Dynamical Theory of the Electromagnetic Field". 1865.
Description: "A Dynamical Theory of the Electromagnetic Field" was the third of James Clerk Maxwell's papers concerned with electromagnetism. The concept of displacement current was introduced, so that it became possible to derive equations of electromagnetic wave. It was the first paper in which Maxwell's equations appear ...
See also:List of publications in physics, List of publications in physics - Classical mechanics, List of publications in physics - Philosophiae Naturalis Principia Mathematica, List of publications in physics - Special theory of relativity, List of publications in physics - On the Electrodynamics of Moving Bodies, List of publications in physics - General theory of relativity, List of publications in physics - The Foundation of the General Theory of Relativity, List of publications in physics - Quantum theory, List of publications in physics - On the Law of Distribution of Energy in the Normal Spectrum, List of publications in physics - Thermodynamics, List of publications in physics - An Experimental Enquiry Concerning the Source of the Heat which is Excited by Friction, List of publications in physics - On the Equilibrium of Heterogeneous Substances, List of publications in physics - Statistical mechanics, List of publications in physics - On the Motion—Required by the Molecular Kinetic Theory of Heat—of Small Particles Suspended in a Stationary Liquid, List of publications in physics - Scaling laws for Ising models near Tc, List of publications in physics - The renormalization group: critical phenomena and the Kondo problem, List of publications in physics - Electromagnetism, List of publications in physics - A Dynamical Theory of the Electromagnetic Field, List of publications in physics - Fluid dynamics, List of publications in physics - An experimental investigation of the circumstances which determine whether the motion of water shall be direct or sinuous and of the law of resistance in parallel channels, List of publications in physics - The local structure of turbulence in incompressible viscous fluid for very large Reynolds numbers, List of publications in physics - Statistical fluid mechanics, List of publications in physics - Nonlinear dynamics and chaos, List of publications in physics - Deterministic nonperiodic flow, List of publications in physics - Quantum field theory, List of publications in physics - Space-Time approach to Quantum Electrodynamics, List of publications in physics - Cosmology, List of publications in physics - The Early Universe, List of publications in physics - Condensed matter physics, List of publications in physics - Theory of superconductivity, List of publications in physics - Standard Model, List of publications in physics - Computational physics, List of publications in physics - Accelerator physics, List of publications in physics - Acoustics, List of publications in physics - Astrophysics, List of publications in physics - Cryogenics, List of publications in physics - Polymer physics, List of publications in physics - Optics, List of publications in physics - Materials physics, List of publications in physics - Nuclear physics, List of publications in physics - Plasma physics, List of publications in physics - The Collected Works of Irving Langmuir 1961, List of publications in physics - Cosmical Electrodynamics 2nd ed. 1963, List of publications in physics - Particle physics, List of publications in physics - Vehicle dynamics, List of publications in physics - Astronomy, List of publications in physics - Biophysics, List of publications in physics - Cycles, List of publications in physics - Geophysics, List of publications in physics - Mathematical physics, List of publications in physics - Medical physics, List of publications in physics - Physical chemistry, List of publications in physics - Physics of computation Read more here: » List of publications in physics: Encyclopedia II - List of publications in physics - Electromagnetism |
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| | | |  |  |  | Electromagnetic Field: Encyclopedia II - Electromagnetic radiation - Physics
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 ...
See also: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 Read more here: » Electromagnetic radiation: Encyclopedia II - Electromagnetic radiation - Physics |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Gravity - Comparison with electromagnetic forceThe gravitational attraction between protons is approximately a factor of 1036 weaker than the electromagnetic repulsion. This factor is independent of distance, because both interactions are inversely proportional to the square of the distance. Therefore on an atomic scale mutual gravity is negligible. Even so, the main interaction between everyday objects and the Earth and between celestial bodies is gravity, because at this scale matter is electrically neutral. This means that there is an equal number of positively charged part ...
See also:Gravity, Gravity - Overview of the history of gravitational theory, Gravity - Newton's law of universal gravitation, Gravity - Acceleration due to gravity, Gravity - Bodies with spatial extent, Gravity - Vector form, Gravity - Gravitational field, Gravity - The Earth's gravity, Gravity - Comparative gravities of the Earth Sun Moon and planets, Gravity - Mathematical equations for a falling body, Gravity - Gravitational potential, Gravity - Acceleration relative to the rotating Earth, Gravity - Gravity and astronomy, Gravity - Self-gravitating system, Gravity - Practical uses of gravity, Gravity - Problems with Newton's theory, Gravity - Theoretical concerns, Gravity - Disagreement with observation, Gravity - Newton's reservations, Gravity - Einstein's theory of gravitation, Gravity - Experimental tests, Gravity - Comparison with electromagnetic force, Gravity - Gravity and quantum mechanics, Gravity - Alternative theories, Gravity - Recent alternative theories, Gravity - Historical alternative theories, Gravity - Notes Read more here: » Gravity: Encyclopedia II - Gravity - Comparison with electromagnetic force |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Gravity - Comparison with electromagnetic forceThe gravitational attraction between protons is approximately a factor of 1036 weaker than the electromagnetic repulsion. This factor is independent of distance, because both interactions are inversely proportional to the square of the distance. Therefore on an atomic scale mutual gravity is negligible. Even so, the main interaction between everyday objects and the Earth and between celestial bodies is gravity, because at this scale matter is electrically neutral. This means that there is an equal number of positively charged part ...
See also:Gravity, Gravity - Overview of the history of gravitational theory, Gravity - The Earth's gravity, Gravity - Comparative gravities of the Earth Sun Moon and planets, Gravity - Mathematical equations for a falling body, Gravity - Gravitational potential, Gravity - Acceleration relative to the rotating Earth, Gravity - Gravity and astronomy, Gravity - Self-gravitating system, Gravity - Practical uses of gravity, Gravity - Newton's law of universal gravitation, Gravity - Acceleration due to gravity, Gravity - Bodies with spatial extent, Gravity - Vector form, Gravity - Gravitational field, Gravity - Problems with Newton's theory, Gravity - Theoretical concerns, Gravity - Disagreement with observation, Gravity - Newton's reservations, Gravity - Einstein's theory of gravitation, Gravity - Experimental tests, Gravity - Comparison with electromagnetic force, Gravity - Gravity and quantum mechanics, Gravity - Alternative theories, Gravity - Recent alternative theories, Gravity - Historical alternative theories, Gravity - Notes Read more here: » Gravity: Encyclopedia II - Gravity - Comparison with electromagnetic force |
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| | |  |  |  | Electromagnetic Field: Encyclopedia II - Magnetic field - Energy in the magnetic fieldThe general relation for nonlinear materials, the differential energy is:
Where V is the volume and dV is the differential volume.
For linear materials, H is proportional to B, so the above equation can be simplified:
For linear materials and a constant volume:
Energy can produce a force, so
Where dl is differential distance and A is the surface area. Force per unit area (pressure) is
In the case of free space (air), :
at B ...
See also:Magnetic field, Magnetic field - Symbols and terminology, Magnetic field - Definition, Magnetic field - Current loop, Magnetic field - Point charge generating magnetic field, Magnetic field - Vector calculus, Magnetic field - Energy in the magnetic field, Magnetic field - Properties, Magnetic field - Magnetic field lines, Magnetic field - Pole labeling confusions, Magnetic field - Rotating magnetic fields, Magnetic field - External articles Read more here: » Magnetic field: Encyclopedia II - Magnetic field - Energy in the magnetic field |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Electromagnetic radiation - DerivationElectromagnetic 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 ...
See also: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 Read more here: » Electromagnetic radiation: Encyclopedia II - Electromagnetic radiation - Derivation |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Magnetic field - Symbols and terminologyMagnetic field is usually denoted by the symbol . Historically, was called the magnetic flux density, magnetic induction, or magnetic field strength. was called the magnetic field (or magnetic field intensity), and this terminology is still often used to distinguish the two in the context of magnetic materials (non-trivial permeability μ). Otherwise, however, this distinction is often ignored, and both symbols are frequently referred to as the magnetic field. (Some authors call H the auxiliary field, instead.) In linear materials, such as air or free space, the ...
See also:Magnetic field, Magnetic field - Symbols and terminology, Magnetic field - Definition, Magnetic field - Current loop, Magnetic field - Point charge generating magnetic field, Magnetic field - Vector calculus, Magnetic field - Energy in the magnetic field, Magnetic field - Properties, Magnetic field - Magnetic field lines, Magnetic field - Pole labeling confusions, Magnetic field - Rotating magnetic fields, Magnetic field - External articles Read more here: » Magnetic field: Encyclopedia II - Magnetic field - Symbols and terminology |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Gravity - Gravity and quantum mechanicsIt is widely believed that three of the four fundamental forces (the strong nuclear force, the weak nuclear force, and the electromagnetic force) are manifestations of a single, more fundamental force. Combining gravity with these forces of quantum mechanics to create a theory of quantum gravity is currently an important topic of research amongst physicists.
General relativity is an essentially geometric theory that requires no exchange of particles in its explanation of gravity, whereas quantum mechanics relies on interactions betwee ...
See also:Gravity, Gravity - Overview of the history of gravitational theory, Gravity - Newton's law of universal gravitation, Gravity - Acceleration due to gravity, Gravity - Bodies with spatial extent, Gravity - Vector form, Gravity - Gravitational field, Gravity - The Earth's gravity, Gravity - Comparative gravities of the Earth Sun Moon and planets, Gravity - Mathematical equations for a falling body, Gravity - Gravitational potential, Gravity - Acceleration relative to the rotating Earth, Gravity - Gravity and astronomy, Gravity - Self-gravitating system, Gravity - Practical uses of gravity, Gravity - Problems with Newton's theory, Gravity - Theoretical concerns, Gravity - Disagreement with observation, Gravity - Newton's reservations, Gravity - Einstein's theory of gravitation, Gravity - Experimental tests, Gravity - Comparison with electromagnetic force, Gravity - Gravity and quantum mechanics, Gravity - Alternative theories, Gravity - Recent alternative theories, Gravity - Historical alternative theories, Gravity - Notes Read more here: » Gravity: Encyclopedia II - Gravity - Gravity and quantum mechanics |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Gravity - Gravity and quantum mechanicsIt is widely believed that three of the four fundamental forces (the strong nuclear force, the weak nuclear force, and the electromagnetic force) are manifestations of a single, more fundamental force. Combining gravity with these forces of quantum mechanics to create a theory of quantum gravity is currently an important topic of research amongst physicists.
General relativity is an essentially geometric theory that requires no exchange of particles in its explanation of gravity, whereas quantum mechanics relies on interactions betwee ...
See also:Gravity, Gravity - Overview of the history of gravitational theory, Gravity - The Earth's gravity, Gravity - Comparative gravities of the Earth Sun Moon and planets, Gravity - Mathematical equations for a falling body, Gravity - Gravitational potential, Gravity - Acceleration relative to the rotating Earth, Gravity - Gravity and astronomy, Gravity - Self-gravitating system, Gravity - Practical uses of gravity, Gravity - Newton's law of universal gravitation, Gravity - Acceleration due to gravity, Gravity - Bodies with spatial extent, Gravity - Vector form, Gravity - Gravitational field, Gravity - Problems with Newton's theory, Gravity - Theoretical concerns, Gravity - Disagreement with observation, Gravity - Newton's reservations, Gravity - Einstein's theory of gravitation, Gravity - Experimental tests, Gravity - Comparison with electromagnetic force, Gravity - Gravity and quantum mechanics, Gravity - Alternative theories, Gravity - Recent alternative theories, Gravity - Historical alternative theories, Gravity - Notes Read more here: » Gravity: Encyclopedia II - Gravity - Gravity and quantum mechanics |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Magnetic field - DefinitionLike the electric field, the magnetic field can be defined by the force it produces. In SI units, this is:
where
F is the force produced, measured in newtons
indicates a vector cross product
is electric charge that the magnetic field is acting on, measured in coulombs
is velocity of the electric charge , measured in metres per second
B is mag ...
See also:Magnetic field, Magnetic field - Symbols and terminology, Magnetic field - Definition, Magnetic field - Current loop, Magnetic field - Point charge generating magnetic field, Magnetic field - Vector calculus, Magnetic field - Energy in the magnetic field, Magnetic field - Properties, Magnetic field - Magnetic field lines, Magnetic field - Pole labeling confusions, Magnetic field - Rotating magnetic fields, Magnetic field - External articles Read more here: » Magnetic field: Encyclopedia II - Magnetic field - Definition |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Magnetic field - PropertiesMaxwell did much to unify static electricity and magnetism, producing a set of four equations relating the two fields. However, under Maxwell's formulation, there were still two distinct fields describing different phenomena. It was Albert Einstein who showed, using special relativity, that electric and magnetic fields are two aspects of the same thing (a rank-2 tensor), and that one observer may perceive a magnetic force where a moving observer perceives only an electrostatic force. Thus, using special relativity, magnetic forces are a mani ...
See also:Magnetic field, Magnetic field - Symbols and terminology, Magnetic field - Definition, Magnetic field - Current loop, Magnetic field - Point charge generating magnetic field, Magnetic field - Vector calculus, Magnetic field - Energy in the magnetic field, Magnetic field - Properties, Magnetic field - Magnetic field lines, Magnetic field - Pole labeling confusions, Magnetic field - Rotating magnetic fields, Magnetic field - External articles Read more here: » Magnetic field: Encyclopedia II - Magnetic field - Properties |
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| |  |  |  | Electromagnetic Field: Encyclopedia II - Electromagnetic spectroscopy - Types of electromagnetic radiation measuredThis can be in any range of wavelengths:
Radio waves
Microwaves
Infrared light (see infrared spectroscopy)
Visible light (see UV/visible spectroscopy)
Ultraviolet light (see UV/visible spectroscopy)
X-rays
Electromagnetic spectroscopy can be classified into narrower fields as discussed below, though in some spectroscopic techniques, several processes may be happening at the same time.
...
See also: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 Read more here: » Electromagnetic spectroscopy: Encyclopedia II - Electromagnetic spectroscopy - Types of electromagnetic radiation measured |
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|  |  |  | Electromagnetic Field: Encyclopedia II - Gravity - Alternative theories
Gravity - Recent alternative theories.
Brans-Dicke theory of gravity
Rosen bi-metric theory of gravity
In the modified Newtonian dynamics (MOND), Mordehai Milgrom proposes a modification of Newton's Second Law of motion for small accelerations.
Gravity - Historical alternative theories.
Nikola Tesla challenged Albert Einstein's theory of relativity, announcing he was working on a Dynamic theory of gravity (which began between 1892 and ...
See also:Gravity, Gravity - Overview of the history of gravitational theory, Gravity - Newton's law of universal gravitation, Gravity - Acceleration due to gravity, Gravity - Bodies with spatial extent, Gravity - Vector form, Gravity - Gravitational field, Gravity - The Earth's gravity, Gravity - Comparative gravities of the Earth Sun Moon and planets, Gravity - Mathematical equations for a falling body, Gravity - Gravitational potential, Gravity - Acceleration relative to the rotating Earth, Gravity - Gravity and astronomy, Gravity - Self-gravitating system, Gravity - Practical uses of gravity, Gravity - Problems with Newton's theory, Gravity - Theoretical concerns, Gravity - Disagreement with observation, Gravity - Newton's reservations, Gravity - Einstein's theory of gravitation, Gravity - Experimental tests, Gravity - Comparison with electromagnetic force, Gravity - Gravity and quantum mechanics, Gravity - Alternative theories, Gravity - Recent alternative theories, Gravity - Historical alternative theories, Gravity - Notes Read more here: » Gravity: Encyclopedia II - Gravity - Alternative theories |
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