nagle_phys2020_fa07_lecture25

nagle_phys2020_fa07_lecture25 - Exam #2 Solutions posted on...

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1 77 • Exam #2 Solutions posted on the web page. • Mean = 71 • Standard Deviation = 15.5 More Information to be posted later today on the web page. • CAPA #9 due on Friday (shorter than usual). • Reading Chapter 20 for this week. 78 79 Clicker Question i 1 i 2 Two loops of wire have current going around in the same direction. The forces between the loops is: A)Attractive B)Repulsive C)Net force is zero. 80 Demonstration 81 Good time to take stock of what we have learned. 2 0 ˆ 4 r r L i B × Δ = Δ v v π μ 2 0 ˆ 4 r r v q B × = v v Moving charges (currents) create B-fields. Where are the moving charges? 82 Atoms have moving electric charges.
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2 83 5Tesla 2 B 0 = R i μ v Consider a single electron moving in a circular orbit around the nucleus. A m s m C 4 10 6 19 10 6 . 7 ) 10 ( 2 ) / 10 3 )( 10 6 . 1 ( R 2 ev i × = × × = = π What is the B-field at the center (at the nucleus)? Electron in orbit,
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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_lecture25 - Exam #2 Solutions posted on...

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