Lecture 14 feb19 preview

# Lecture 14 feb19 preview - Exam watch Lecture 14 Magnetic...

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Lecture 14 Magnetic Fields and Forces Exam #2 March 6 (week after winter break) Chapters 24-27 Watch for a practice exam mid week Exam watch

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Magnetism Forces between objects without any net electrical charge…. . Evidence for 2 magnetic “charges”, “N” and “S” Like E field we suspect magnets create a magnetic field, B, in space around it…. .vector field Can we write Is there a “Coulomb’s Law “ for magnetism? ? B q F M M = Kinda, maybe, sorta, sure….but there are some glaring differences between B and E fields: 1. Magnetic monopoles have never been isolated 1. B field lines never end--they are loops!
B field lines (compare with E field lines) 1. is tangent to line at any point 1. and 1. B field lines are loops…(this is definitely not like E field lines……next slide) B A d B flux thus and dA dN B surf B = Φ = , Same Same Same

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Question 1 What is the implication of B field lines being continuous loops? A. Φ B is not defined for a closed (Gaussian surface) B. Φ B is not defined for an open surface C. Φ B for a closed surface will always be zero D. Φ B for an open surface will always be zero E. B Lines must begin on N magnetic charges and end on S

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Gauss’s Law for Magnetism 0 surf closed = A d B Flux in = Flux out No magnetic monopoles Maxwell’s 2 nd equation!
Oersted’s Experiment/Demo (1820) (connects magnetism with electricity)

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Lecture 14 feb19 preview - Exam watch Lecture 14 Magnetic...

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