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- Dipole abstract "In physics, there are several kinds of dipole:An electric dipole is a separation of positive and negative charges. The simplest example of this is a pair of electric charges of equal magnitude but opposite sign, separated by some (usually small) distance. A permanent electric dipole is called an electret.A magnetic dipole is a closed circulation of electric current. A simple example of this is a single loop of wire with some constant current through it.A current dipole is a current from a sink of current to a source of current within a (usually conducting) medium. Current dipoles are often used to model neuronal sources of electromagnetic fields that can be measured using MEG or EEG technologies.Dipoles can be characterized by their dipole moment, a vector quantity. For the simple electric dipole given above, the electric dipole moment points from the negative charge towards the positive charge, and has a magnitude equal to the strength of each charge times the separation between the charges. (To be precise: for the definition of the dipole moment, one should always consider the "dipole limit", where e.g. the distance of the generating charges should converge to 0, while simultaneously the charge strength should diverge to infinity in such a way that the product remains a positive constant.)For the current loop, the magnetic dipole moment points through the loop (according to the right hand grip rule), with a magnitude equal to the current in the loop times the area of the loop.In addition to current loops, the electron, among other fundamental particles, has a magnetic dipole moment. This is because it generates a magnetic field that is identical to that generated by a very small current loop. However, the electron's magnetic moment is not due to a current loop, but is instead an intrinsic property of the electron. It is also possible that the electron has an electric dipole moment, although this has not yet been observed (see electron electric dipole moment for more information).A permanent magnet, such as a bar magnet, owes its magnetism to the intrinsic magnetic dipole moment of the electron. The two ends of a bar magnet are referred to as poles (not to be confused with monopoles), and may be labeled "north" and "south". In terms of the Earth's magnetic field, these are respectively "north-seeking" and "south-seeking" poles, that is if the magnet were freely suspended in the Earth's magnetic field, the north-seeking pole would point towards the north and the south-seeking pole would point twards the south. The dipole moment of the bar magnet points from its magnetic south to its magnetic north pole. The north pole of a bar magnet in a compass points north. However, this means that Earth's geomagnetic north pole is the south pole (south-seeking pole) of its dipole moment, and vice versa.The only known mechanisms for the creation of magnetic dipoles are by current loops or quantum-mechanical spin since the existence of magnetic monopoles has never been experimentally demonstrated.The term comes from the Greek δίς (dis), "twice" and πόλος (pòlos), "axis".".
- Dipole thumbnail VFPt_Dipole_field.svg?width=300.
- Dipole wikiPageExternalLink ElectricDipolePotential.
- Dipole wikiPageExternalLink EnergyDensityOfAMagneticDipole.
- Dipole wikiPageExternalLink geomag.usgs.gov.
- Dipole wikiPageExternalLink ch05.html.
- Dipole wikiPageExternalLink Applet3-page.htm.
- Dipole wikiPageID "8378".
- Dipole wikiPageLength "26342".
- Dipole wikiPageOutDegree "129".
- Dipole wikiPageRevisionID "683811965".
- Dipole wikiPageWikiLink 1,2-Dichloroethene.
- Dipole wikiPageWikiLink 1,2-dichloroethene.
- Dipole wikiPageWikiLink Angular_frequency.
- Dipole wikiPageWikiLink Atomic_number.
- Dipole wikiPageWikiLink Axial_multipole_moments.
- Dipole wikiPageWikiLink Bond_dipole_moment.
- Dipole wikiPageWikiLink Boron_trifluoride.
- Dipole wikiPageWikiLink Capacitor.
- Dipole wikiPageWikiLink Carbon_dioxide.
- Dipole wikiPageWikiLink Carbon_monoxide.
- Dipole wikiPageWikiLink Category:Electromagnetism.
- Dipole wikiPageWikiLink Category:Potential_theory.
- Dipole wikiPageWikiLink Chemical_polarity.
- Dipole wikiPageWikiLink Cis-trans_isomerism.
- Dipole wikiPageWikiLink Cis–trans_isomerism.
- Dipole wikiPageWikiLink Compass.
- Dipole wikiPageWikiLink Current_dipole.
- Dipole wikiPageWikiLink Cyanamide.
- Dipole wikiPageWikiLink Cylindrical_multipole_moments.
- Dipole wikiPageWikiLink Debye.
- Dipole wikiPageWikiLink Degenerate_energy_level.
- Dipole wikiPageWikiLink Degenerate_energy_levels.
- Dipole wikiPageWikiLink Degree_(angle).
- Dipole wikiPageWikiLink Dielectric_constant.
- Dipole wikiPageWikiLink Dipole_model_of_the_Earths_magnetic_field.
- Dipole wikiPageWikiLink Dirac_delta_function.
- Dipole wikiPageWikiLink Electret.
- Dipole wikiPageWikiLink Electric_charge.
- Dipole wikiPageWikiLink Electric_current.
- Dipole wikiPageWikiLink Electric_dipole.
- Dipole wikiPageWikiLink Electric_dipole_moment.
- Dipole wikiPageWikiLink Electric_field.
- Dipole wikiPageWikiLink Electric_potential.
- Dipole wikiPageWikiLink Electrical_dipole_moment.
- Dipole wikiPageWikiLink Electron.
- Dipole wikiPageWikiLink Electron_charge.
- Dipole wikiPageWikiLink Electron_density.
- Dipole wikiPageWikiLink Electron_electric_dipole_moment.
- Dipole wikiPageWikiLink Electronegativity.
- Dipole wikiPageWikiLink Electrostatic_potential.
- Dipole wikiPageWikiLink Elementary_charge.
- Dipole wikiPageWikiLink Elementary_particle.
- Dipole wikiPageWikiLink Euclidean_vector.
- Dipole wikiPageWikiLink Force.
- Dipole wikiPageWikiLink Fundamental_particle.
- Dipole wikiPageWikiLink Gradient.
- Dipole wikiPageWikiLink Greek_language.
- Dipole wikiPageWikiLink Henry_(unit).
- Dipole wikiPageWikiLink Hermitian_adjoint.
- Dipole wikiPageWikiLink Hydrogen_cyanide.
- Dipole wikiPageWikiLink Hydrogen_fluoride.
- Dipole wikiPageWikiLink Indian_Ocean_Dipole.
- Dipole wikiPageWikiLink Intermolecular_force.
- Dipole wikiPageWikiLink Intrinsic.
- Dipole wikiPageWikiLink Intrinsic_and_extrinsic_properties.
- Dipole wikiPageWikiLink Inversion_in_a_point.
- Dipole wikiPageWikiLink Ionic_bond.
- Dipole wikiPageWikiLink Ionic_bonding.
- Dipole wikiPageWikiLink Joule.
- Dipole wikiPageWikiLink Laplace_expansion_(potential).
- Dipole wikiPageWikiLink Laplace–Runge–Lenz_vector.
- Dipole wikiPageWikiLink London_dispersion_force.
- Dipole wikiPageWikiLink Magnet.
- Dipole wikiPageWikiLink Magnetic_dipole.
- Dipole wikiPageWikiLink Magnetic_dipole-dipole_interaction.
- Dipole wikiPageWikiLink Magnetic_dipole_moment.
- Dipole wikiPageWikiLink Magnetic_dipole–dipole_interaction.
- Dipole wikiPageWikiLink Magnetic_field.
- Dipole wikiPageWikiLink Magnetic_moment.
- Dipole wikiPageWikiLink Magnetic_monopole.
- Dipole wikiPageWikiLink Molecular_geometry.
- Dipole wikiPageWikiLink Molecular_solid.
- Dipole wikiPageWikiLink Molecule.
- Dipole wikiPageWikiLink Multipole_expansion.
- Dipole wikiPageWikiLink North_Pole.
- Dipole wikiPageWikiLink North_pole.
- Dipole wikiPageWikiLink Ozone.
- Dipole wikiPageWikiLink Parity_(physics).
- Dipole wikiPageWikiLink Permeability_(electromagnetism).
- Dipole wikiPageWikiLink Permittivity_of_free_space.
- Dipole wikiPageWikiLink Peter_Debye.
- Dipole wikiPageWikiLink Phosgene.
- Dipole wikiPageWikiLink Physics.
- Dipole wikiPageWikiLink Point_reflection.
- Dipole wikiPageWikiLink Polarizability.
- Dipole wikiPageWikiLink Polarization_density.
- Dipole wikiPageWikiLink Potassium_bromide.
- Dipole wikiPageWikiLink Poynting_vector.
- Dipole wikiPageWikiLink Quadrupole.