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Magnetni pretok - Wikipedija, prosta enciklopedija

Magnetni pretok

Iz Wikipedije, proste enciklopedije

Magnétni pretòk (oznaka Φm) je merilo za število magnetnih silnic skozi izbrano ploskev. Mednarodni sistem enot predpisuje zanj izpeljano enoto Vs.

Če poznamo gostoto magnetnega polja oz. gostoto magnetnega pretoka B, lahko zapišemo splošni izraz za magnetni pretok skozi površino S:

\Phi_m = \int_S \mathbf{B}\cdot d\mathbf{S}

Magnetni pretok skozi zaključeno površino je enak:

Φe = 0

Zveza velja splošno in je znana kot zakon o magnetnem pretoku, ki predstavlja eno od Maxwellovih enačb:

\oint_S \mathbf{B}\cdot d\mathbf{S} = 0

[uredi] Indukcijski zakon

Če cev magnetnih silnic objema zanka, je v zanki inducirana napetost enaka negativni časovni spremembi objetega magnetnega pretoka:

U_i = \oint \mathbf{E}\cdot d\mathbf{s} = - \frac{d\Phi_m}{dt} \; .

Ugotovitev je znana kot indukcijski zakon ali Faradayev zakon, ki prav tako predstavlja eno od Maxwellovih enačb.

[uredi] Glej tudi

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