Magnetic force between currentsGuest Lecture: Farley Ferrante3/29/2011Supplementary Material for PHY1308 (General Physics – Electricity and Magnetism)Announcements●Homework 8:●Available today from the instructor by e-mail●Next Quiz●Thursday, beginning of class●Covers Homework 7The attraction of Two Wireshttp://www.youtube.com/watch?v=43AeuDvWc0kxyyzBohr Model of the Atom(not to scale!)●Introduced in 1913.●Very successful at explaining atomic properties. ●Replaced by full quantum mechanical model in 1920s.~10-10 mTreat the atom like a “planetary system” - electrons in orbit around nucleus, maintained by electric force.terrestrial magnetismRefrigerator magnets: ~0.01 TRare earth magnets: ~0.5-1.0 TSo, the scale of terrestrial magnetism is about 1
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