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induction2

# induction2 - Electromagnetic Induction We introduced...

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1 Electromagnetic Induction We introduced motional emf and Faraday’s Law through these two examples: Today we will the discussion about Faraday’s Law of Induction and introduce the following new law and concepts: Lenz’s Law, mutual induction and self-induction, and finally introduce the 3 rd (and last) passive component in a circuit: the inducotr.

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2 Faraday’s Law of Induction Faraday’s Law of Induction says that the induced emf comes from the magnetic flux changing rate (with respect to time) with a minus sign in front of this rate: With a special rectangular loop, we proved that one can derive Faraday’s Law from this motional emf formula: But Faraday’s Law applies to any kind of magnetic flux change, like this one (see figure) where the change comes not from the area, but from the magnetic field strength, caused by the motion of the bar magnet. dt ) A B ( d dt d emf B - - = Φ LvB dt dA B dt ) A B ( d dt d emf B - = - = - - = dt dB A dt ) A B ( d dt d emf B - = - - =
3 Faraday’s Law and the induced electric field What actually is induced by the changing magnetic flux? Let’s have a “peek” into the moving wire: This is the electric field E that is induced and that is the source of the inducted emf, because Here the direction of the L follows the

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induction2 - Electromagnetic Induction We introduced...

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