nagle_phys2020_fa07_lecture27

nagle_phys2020_fa07_lecture27 - Solenoid A single wire...

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1 1 Solenoid A single wire tightly coiled up into loops. Since it is a single wire, the current magnitude is the same in all parts of the coil. 2 3 4 5 r r kQ E ˆ 2 = v 2 0 ˆ 4 r r v q B × = v v π μ So far we have found that Electric charges create E-fields Moving electric charges create B-fields But this is not the whole story! 6 Electric Fields can also be created by a changing Magnetic Field. Magnetic Fields can also be created by a changing Electric Field. This is described by Faraday’s Law. This will help complete the set of equations called Maxwell’s equations of electricity and magnetism.
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2 7 Faraday’s Law of Induction t B Δ ΔΦ = ε Two new quantities introduced. 1.Magnetic Flux = Φ B 2.Electro Motive Force (EMF) = ε 8 A B A d B surf B v v v v = = Φ Electric Flux Magnetic Flux is quite similar except for Magnetic Fields. A E A d E surf E v v v v = = Φ 9 New concept: Magnetic Flux Φ B through a surface Surface with some area A has some electric flux (B-field lines) through it.
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This note was uploaded on 02/27/2008 for the course PHYS 2020 taught by Professor Dubson during the Fall '06 term at Colorado.

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nagle_phys2020_fa07_lecture27 - Solenoid A single wire...

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