PHY132_L18 - Midterm 1 Grade Distribution 03/12/2010...

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Midterm 1 Grade Distribution 03/12/2010 Lecture 18 1
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Lecture 18 2 Classical Physics II PHY132 Lecture 18 Faraday’s Law, Lenz’ Law 03/12/2010
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Lecture 18 3 Varying Magnetic Flux The AMAZING conclusion from the above discussion is that (between the plates) a magnetic field is generated by a time-varying electric flux d E /dt ! We will now discuss the mirror effect: a time-varying magnetic flux d B /dt induces an electric field ! Magnetic Flux defined: B • • B ·d A Note Gauss’ Law for Magnetism: Consider a conducting wire of length L moving with a velocity v perpendicular to a uniform magnetic field B : closed surface 0 d ⋅= BA 03/12/2010
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Lecture 18 4 Faraday’s Induction Law Recap the definition of Magnetic Flux: B • • B · d A Note: for a CLOSED surface: Now consider a L m long piece of conduc - ting rod moving with velocity v perpendi - cular to a uniform and constant magne - tic field B : the Lorentz force on charge carriers q in the rod is: – the F L pushes charges – to accumulate at the ends of the rod an EMF is created: a first example of Faraday’s Induction Law surface Gauss' Law for Magetism; 0 absence of magnetic monopoles d ⋅= closed BA ( ) () 0 0 00 L qv B qv qvB qvB B = × = = −− = i jk Fi k j j B x y V = ∆ E dx BL dt = − L v F L ++ − − 03/12/2010 0 L d = −⋅ El L F L q = − vBL = − dA B dt = − B d
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This note was uploaded on 04/14/2010 for the course PHY 132 taught by Professor Rijssenbeek during the Spring '04 term at SUNY Stony Brook.

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PHY132_L18 - Midterm 1 Grade Distribution 03/12/2010...

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