# lect19 - Physics 227 Exam 2 Information Note exam 2 16...

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Physics 227: Exam 2 Information Note: exam 2: 16 questions covering chapters 25 - 28 Thursday, Nov 17, 2011, 9:40 PM - 11:00 PM Room assignments: A-I Arc 103 J-M SEC 111 - probably starts 9:50 or 10:00. N-R PLH S-Z Beck Auditorium, Livingston Campus!!! (NOT Hill 114) Anyone with a conflict should contact Prof. Cizewski ASAP Bring pencils, 1 formula sheet w/ anything you want, NO calculators or other electronics needed or allowed! Thursday, November 10, 2011

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Physics 227: Lecture 19 Comments on Electric Fields, Eddy Currents, Superconductivity Lecture 18 review: Faraday’s Law: ε = -d φ B /dt. Lenz’s Law: ε opposes change. Alternators. Generators. Motional emf. Today: lots of nice demos! Thursday, November 10, 2011
Superconducting iClicker The emf, when the loop shown is pulled out of the magnetic field region, is ε = 0.4x0.02xB V CW. Usually I = V/R. But if the loop is superconducting, what is the current in it? A. ε / R = ε / 0 = A. B. It cannot be , so it must be 0. C. Because it is a superconductor, ε = 0 and I = 0. D. It is some number between 0 and that we do not know how to calculate. E. It is some number between 0 and that cannot be calculated in principle - it is random. The superconductor is not special - there will be an emf and non- current, but we do not know how to calculate it. Thursday, November 10, 2011

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Maxwell’s Equations In the late 1800s the knowledge of electric and magnetic fields was summarized with Maxwell’s Equations: · E = ρ 0
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