Point charge

Point charge

A point charge is an idealized model of a particle which has an electric charge. A point charge is an electric charge at a mathematical point with no dimensions.

The fundamental equation of electrostatics is Coulomb's law, which describes the electric force between two point charges. The electric field associated with a classical point charge increases to infinity as the distance from the point charge decreases towards zero making energy (thus mass) of point charge infinite. In quantum electrodynamics, developed in part by Richard Feynman, the mathematical method of renormalization eliminates the infinite divergence of the point charge.

Earnshaw's theorem states that a collection of point charges cannot be maintained in an equilibrium configuration solely by the electrostatic interaction of the charges.

ee also

*Test charge
*Charge (physics) (charge, generally, i.e. not limited to "electric charge")
**Mass (sometimes referred to as "gravitational charge")
**Electric charge
**Weak isospin ("charge" associated with weak interaction)
**Color charge

References

* Eric W. Weisstein, " [http://scienceworld.wolfram.com/physics/PointCharge.html Point Charge] ".
* F. H. J. Cornish, " [http://www.iop.org/EJ/abstract/0370-1328/86/3/301 Classical radiation theory and point charges] ". Proc. Phys. Soc. 86 427-442, 1965. doi:10.1088/0370-1328/86/3/301
* O. D. Jefimenko, "Direct calculation of the electric and magnetic fields of an electric point charge moving with constant velocity". Am. J. Phys.62 (1994), 79.


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • point charge — taškinis krūvis statusas T sritis Standartizacija ir metrologija apibrėžtis Elektros krūvis, kurio užimtos erdvės matmenų nepaisoma. atitikmenys: angl. point charge vok. Punktladung, f rus. точечный заряд, m pranc. charge ponctuelle, f; charge… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • point charge — taškinis krūvis statusas T sritis fizika atitikmenys: angl. point charge vok. punktförmige Ladung, f; Punktladung, f rus. точечный заряд, m pranc. charge ponctuelle, f …   Fizikos terminų žodynas

  • point charge — an electric charge considered to exist at a single point, and thus having neither area nor volume. [1900 05] * * * n. chiefly Physics an electric charge regarded as concentrated in a mathematical point, without spatial extent …   Useful english dictionary

  • point charge — an electric charge considered to exist at a single point, and thus having neither area nor volume. [1900 05] * * * …   Universalium

  • zero-point charge — nulinio krūvio potencialas statusas T sritis Standartizacija ir metrologija apibrėžtis Elektrodo potencialas, kuriam esant ant jo paviršiaus dar nenusėda jonai. atitikmenys: angl. potential at the point zero charge; potential zero charge; zero… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • zero-point charge — nulinio krūvio potencialas statusas T sritis chemija apibrėžtis Elektrodo potencialas, kuriam esant elektrodo paviršius neturi elektros krūvio. atitikmenys: angl. potential zero charge; zero point charge rus. потенциал нулевого заряда; точка… …   Chemijos terminų aiškinamasis žodynas

  • charge — Charge, ou fardeau, Onus. Une charge et charté, Vehes, vehis. La charge qu on baille à aucun pour faire quelque chose, Actus, Mandatum, Ministerium, Negotium, Onus. Toute charge qu on prend, ou qu on baille à faire, Prouincia. Une charge… …   Thresor de la langue françoyse

  • Charge Ponctuelle — Une charge ponctuelle est un modèle idéalisé d une particule qui possède une charge électrique. Une charge ponctuelle est une charge électrique localisée en un point sans dimensions. L équation fondamentale de l électrostatique est la loi de… …   Wikipédia en Français

  • Point mass — is an idealistic term used to describe either matter which is infinitely small, or an object which can be thought of as infinitely small. This concept in terms of size is similar to that of point particles, however unlike point particles the… …   Wikipedia

  • Point particle — Standard model of particle physics Standard Model …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”