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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.A flow dipole is a separation of a sink and a source. In a highly viscous medium, a two-beater kitchen mixer causes a dipole flow field.An acoustic dipole is the oscillating version of it. A simple example is a dipole speaker.Any scalar or other field may have a dipole moment.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, to the best of our knowledge, 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 are labeled "north" and "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 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 wikiPageRevisionID "602183246".
- Dipole hasPhotoCollection Dipole.
- Dipole subject Category:Chemical_properties.
- Dipole subject Category:Concepts_in_physics.
- Dipole subject Category:Electromagnetism.
- Dipole comment "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.".
- Dipole label "Dipol".
- Dipole label "Dipol".
- Dipole label "Dipole".
- Dipole label "Dipolo elettrico".
- Dipole label "Dipolo eléctrico".
- Dipole label "Dipool".
- Dipole label "Dipôle électrique".
- Dipole label "Диполь (электродинамика)".
- Dipole label "ثنائي قطب".
- Dipole label "偶極子".
- Dipole label "双極子".
- Dipole sameAs Elektrický_dipól.
- Dipole sameAs Dipol.
- Dipole sameAs Dipolo_eléctrico.
- Dipole sameAs Dipôle_électrique.
- Dipole sameAs Dipolo_elettrico.
- Dipole sameAs 双極子.
- Dipole sameAs Dipool.
- Dipole sameAs Dipol.
- Dipole sameAs m.02bcq.
- Dipole sameAs Q215589.
- Dipole sameAs Q215589.
- Dipole wasDerivedFrom Dipole?oldid=602183246.
- Dipole depiction VFPt_Dipole_field.svg.
- Dipole isPrimaryTopicOf Dipole.
