Poynting , John Henry
(1852–1914) British physicist
Poynting was born at Monton, near Manchester, and educated at the universities of Manchester and Cambridge (1872–76). He served as professor of physics at Mason Science College (later the University of Birmingham) from 1880 until his death in 1914.
He wrote on electrical phenomena and radiation and is best known for Poynting's vector, introduced in his paper On the Transfer of Energy in the Electromagnetic Field (1884). In this he showed that the flow of energy at a point can be expressed by a simple formula in terms of the electric and magnetic forces at that point.
In 1891 he determined the mean density of the Earth and made a determination of the gravitational constant in 1893 through the accurate use of torsion balances. His results were published inThe Mean Density of the Earth (1894) and The Earth; Its Shape, Size, Weight and Spin (1913). Poynting was also the first to suggest, in 1903, the existence of the effect of radiation from the Sun that causes smaller particles in orbit about the Sun to spiral close and eventually plunge in. This was developed by the American physicist Howard Robertson and was related to the theory of relativity in 1937, becoming known as the Poynting–Robertson effect.

Scientists. . 2011.

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  • Poynting, John Henry — ▪ British physicist born Sept. 9, 1852, Monton, Lancashire, Eng. died March 30, 1914, Birmingham, Warwickshire       British physicist who introduced a theorem that assigns a value to the rate of flow of electromagnetic energy known as the… …   Universalium

  • John Henry Poynting — Naissance 9 septembre 1852 Monton dans le Lancashire (Angleterre) Décès 30 mars …   Wikipédia en Français

  • John Henry Poynting — (* 9. September 1852 in Monton nahe Manchester; † 30. März 1914 in Birmingham) war ein englischer Physiker. Poynting war der Sohn des unitarischen Ministers T. Elford Poynting. Er besuchte das Owen s College in Manchester. 1872 er …   Deutsch Wikipedia

  • John Henry Poynting — John Henry Poynting. John Henry Poynting nació el 9 de septiembre de 1852 en Mánchester, Inglaterra. Aquí cursó sus estudios primarios en la Owens Collage para luego estudiar física en la Universidad de Cambridge, donde fue alumno del escocés… …   Wikipedia Español

  • John Henry Poynting — Infobox Scientist name = John Poynting box width = 300px image width = 240px caption = John Henry Poynting (1852 1914) birth date = birth date|1852|09|09 birth place = Monton, Lancashire, England death date = death date and… …   Wikipedia

  • Poynting-Satz — Der Satz von Poynting stellt einen Erhaltungssatz in der Elektrodynamik dar. Damit wird der Energieerhaltungssatz auf elektromagnetische Felder verallgemeinert. Seine Formulierung wird dem britischen Physiker John Henry Poynting zugeschrieben.… …   Deutsch Wikipedia

  • Poynting-Theorem — Der Satz von Poynting stellt einen Erhaltungssatz in der Elektrodynamik dar. Damit wird der Energieerhaltungssatz auf elektromagnetische Felder verallgemeinert. Seine Formulierung wird dem britischen Physiker John Henry Poynting zugeschrieben.… …   Deutsch Wikipedia

  • Poynting vector — ▪ physics       a quantity describing the magnitude and direction of the flow of energy in electromagnetic waves. It is named after English physicist John Henry Poynting (Poynting, John Henry), who introduced it in 1884.       The Poynting vector …   Universalium

  • Poynting's theorem — is a statement due to John Henry Poyntingcite journal author=Poynting, J. H. authorlink=John Henry Poynting year=1884 journal=Phil. Trans. volume=175 pages=277 title=On the Transfer of Energy in the Electromagnetic Field… …   Wikipedia

  • Poynting — bezeichnet: die Dichte und die Richtung des Energietransportes einer elektromagnetischen Welle, siehe Poynting Vektor eine Größe aus der Mehrphasenthermodynamik; siehe Poynting Faktor Poynting ist der Familienname folgender Personen: John Henry… …   Deutsch Wikipedia

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