nagle_phys2020_fa07_lecture28

nagle_phys2020_fa07_lecture28 - CAPA #10 due on Friday...

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1 25 • CAPA #10 due on Friday • Reading in Chapter 21 for this week • Clicker scores posted on CULearn… See me if problems. 26 A loop of wire is spinning rapidly about a stationary axis in uniform magnetic field as shown. True or False: There is a non-zero EMF induced in the loop. A) False, zero EMF B) True, there is an induced EMF Clicker Question 27 The (-) negative sign in Faraday’s Law is more of a reminder. Lenz’s Law: The induced EMF tends to induce a current in the direction which opposes the changes in Magnetic Flux. t B Δ ΔΦ = ε 28 If we move the magnet closer to the loop, what is the direction of the induced EMF and thus the direction of the current in the loop? A B B v v = Φ 1. The Magnetic Flux is increasing. 2. Therefore 0 > Δ ΔΦ t B 3. Induced current must create B- field that fights the change! 29 Induced current must create B-field that fights the change ! An induced B-field down through the
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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_lecture28 - CAPA #10 due on Friday...

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