Poynting vector S yog txhais tias yuav sib npaug rau cov khoom hla (1/μ)E × B, qhov twg μ yog qhov permeability ntawm nruab nrab los ntawm cov hluav taws xob dhau mus. (saib magnetic permeability), E yog qhov amplitude ntawm hluav taws xob teb, thiab B yog qhov amplitude ntawm magnetic teb.
Poynting vector sawv cev dab tsi?
Nyob rau hauv physics, tus Poynting vector sawv cev cov kev taw qhia lub zog flux (lub zog hloov mus rau ib cheeb tsam ntawm ib chav tsev ib lub sij hawm) ntawm ib qho chaw electromagnetic . SI unit ntawm Poynting vector yog watt ib square meter (W/m2). Nws muaj npe tom qab nws tus neeg nrhiav pom John Henry Poynting uas thawj zaug muab nws rau xyoo 1884.
Electromagnetic waves sawv cev li cas?
Kev Sawv Cev Ua Zauv ntawm Electromagnetic Wave
Kev taw qhia ntawm kev nthuav tawm ntawm cov hluav taws xob nthwv dej yog muab los ntawm vector cross khoom ntawm hluav taws xob thiab magnetic teb. Nws yog muab raws li: → E × → B E → × B →.
E thiab H yog dab tsi hauv Poynting vector?
(1) E yog qhov siv hluav taws xob, H yog qhov sib nqus sib nqus, thiab P yog Poynting vector, uas pom tias yog lub zog ntom ntom hauv electromagnetic teb. Kev txuag hluav taws xob yog tsim los ntawm txoj kev ntawm Poynting theorem. 2 Theorem Poynting.
Yuav ua li cas yog qhov kev taw qhia ntawm Poynting vector?
Kev taw qhia ntawmPoynting vector yog perpendicular rau kev taw qhia ntawm kev nthuav tawm ntawm nthwv dej. Kev piav qhia: Poynting vector yog proportional rau tus ntoo khaub lig khoom ntawm hluav taws xob thiab magnetic teb, E X B. Yog li ntawd, nws cov kev taw qhia yog perpendicular rau hluav taws xob thiab sib nqus nthwv dej, piv txwv li, nyob rau hauv cov kev taw qhia ntawm propagation ntawm yoj.
