A report on Magnetic field

The shape of the magnetic field produced by a horseshoe magnet is revealed by the orientation of iron filings sprinkled on a piece of paper above the magnet.
Right hand grip rule: a current flowing in the direction of the white arrow produces a magnetic field shown by the red arrows.
A Solenoid with electric current running through it behaves like a magnet.
A sketch of Earth's magnetic field representing the source of the field as a magnet. The south pole of the magnetic field is near the geographic north pole of the Earth.
One of the first drawings of a magnetic field, by René Descartes, 1644, showing the Earth attracting lodestones. It illustrated his theory that magnetism was caused by the circulation of tiny helical particles, "threaded parts", through threaded pores in magnets.
Hans Christian Ørsted, Der Geist in der Natur, 1854

Vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

- Magnetic field
The shape of the magnetic field produced by a horseshoe magnet is revealed by the orientation of iron filings sprinkled on a piece of paper above the magnet.

101 related topics with Alpha

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Antiferromagnetic ordering

Antiferromagnetism

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In materials that exhibit antiferromagnetism, the magnetic moments of atoms or molecules, usually related to the spins of electrons, align in a regular pattern with neighboring spins (on different sublattices) pointing in opposite directions.

In materials that exhibit antiferromagnetism, the magnetic moments of atoms or molecules, usually related to the spins of electrons, align in a regular pattern with neighboring spins (on different sublattices) pointing in opposite directions.

Antiferromagnetic ordering

The relationship between magnetization and the magnetizing field is non-linear like in ferromagnetic materials.

A selection of various types of rotors

Rotor (electric)

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Moving component of an electromagnetic system in the electric motor, electric generator, or alternator.

Moving component of an electromagnetic system in the electric motor, electric generator, or alternator.

A selection of various types of rotors
Rotor from Hoover Dam generator
Salient pole rotor
Cylindrical rotor

Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.

Magnetic hysteresis

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[[Image:StonerWohlfarthMainLoop.svg|thumb|right|400px|[[Stoner–Wohlfarth model|Theoretical model]] of magnetization

[[Image:StonerWohlfarthMainLoop.svg|thumb|right|400px|[[Stoner–Wohlfarth model|Theoretical model]] of magnetization

against magnetic field

One particle exchange scattering diagram

Virtual particle

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Transient scientific theory known as quantum fluctuation that exhibits some of the characteristics of an ordinary particle, while having its existence limited by the uncertainty principle.

Transient scientific theory known as quantum fluctuation that exhibits some of the characteristics of an ordinary particle, while having its existence limited by the uncertainty principle.

One particle exchange scattering diagram
One-loop diagram with fermion propagator

and the magnetic field strength

Magnetic reconnection: This view is a cross-section through four magnetic domains undergoing separator Parker-Sweet reconnection. Two separatrices (see text) divide space into four magnetic domains with a separator at the center of the figure. Field lines (and associated plasma) flow inward from above and below the separator, reconnect, and spring outward along the current sheet. In-situ spacecraft measurements in the magnetosphere and laboratory plasma experiments mean that this process is increasingly well understood: once started, it proceeds many orders of magnitude faster than predicted by the Parker-Sweet theory.

Magnetic reconnection

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Physical process occurring in highly conducting plasmas in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration.

Physical process occurring in highly conducting plasmas in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration.

Magnetic reconnection: This view is a cross-section through four magnetic domains undergoing separator Parker-Sweet reconnection. Two separatrices (see text) divide space into four magnetic domains with a separator at the center of the figure. Field lines (and associated plasma) flow inward from above and below the separator, reconnect, and spring outward along the current sheet. In-situ spacecraft measurements in the magnetosphere and laboratory plasma experiments mean that this process is increasingly well understood: once started, it proceeds many orders of magnitude faster than predicted by the Parker-Sweet theory.

Magnetic reconnection occurs on timescales intermediate between slow resistive diffusion of the magnetic field and fast Alfvénic timescales.

Oscillating magnetic fields. Sine wave current in each of the three stationary coils produces three sine varying magnetic fields perpendicular to the rotation axis. The three magnetic fields add as vectors to produce a single rotating magnetic field.

Rotating magnetic field

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Oscillating magnetic fields. Sine wave current in each of the three stationary coils produces three sine varying magnetic fields perpendicular to the rotation axis. The three magnetic fields add as vectors to produce a single rotating magnetic field.
U.S. Patent 381968: Mode and plan of operating electric motors by progressive shifting; Field Magnet; Armature; Electrical conversion; Economical; Transmission of energy; Simple construction; Easier construction; Rotating magnetic field principles.
Rotating fields. As the direction of the current through the windings changes, the polarity of the windings changes as well. Since there are two windings acting in conjunction with each other, the polarity of the main field will depend upon the polarity of each winding. The arrow or vector below each diagram indicates the direction of the magnetic field in each case.
Rotating three-phase magnetic field, as indicated by the rotating black arrow

A rotating magnetic field is the resultant magnetic field produced by a system of coils symmetrically placed and supplied with polyphase currents.

Charles-Augustin de Coulomb

Coulomb's law

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[[Image:CoulombsLaw.svg|thumb|right|The magnitude of the electrostatic [[force]]

[[Image:CoulombsLaw.svg|thumb|right|The magnitude of the electrostatic [[force]]

Charles-Augustin de Coulomb
Coulomb's torsion balance
If two charges have the same sign, the electrostatic force between them is repulsive; if they have different sign, the force between them is attractive.
The most basic Feynman diagram for QED interaction between two fermions
Experiment to verify Coulomb's law.

This extra part of the force is called the magnetic force, and is described by magnetic fields.

Vacuum permeability

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Magnetic permeability in a classical vacuum.

Magnetic permeability in a classical vacuum.

The magnetic constant μ0 appears in Maxwell's equations, which describe the properties of electric and magnetic fields and electromagnetic radiation, and relate them to their sources.

Hans Christian Ørsted

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The young H. C. Ørsted
Gravestone
Portrait of Hans Christian Ørsted by Christian Albrecht Jensen (1842)
Statue of Ørsted in Ørstedsparken, in Copenhagen.
Der Geist in der Natur, 1854

Hans Christian Ørsted (, ; often rendered Oersted in English; 14 August 1777 – 9 March 1851) was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism.

Magnetomotive force

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Quantity appearing in the equation for the magnetic flux in a magnetic circuit, often called Ohm's law for magnetic circuits.

Quantity appearing in the equation for the magnetic flux in a magnetic circuit, often called Ohm's law for magnetic circuits.

It is the property of certain substances or phenomena that give rise to magnetic fields: