04_28_Final_Review - EMF(opposing Motional EMF v B How big...

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Today4/28 o Lab: Electromagnetic Induction Last one! o Final Exam Topics i waves i interference i refraction i lenses/mirrors i E-Fields i potential i plates i capacitance i circuits i B-fields
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Final Exam o Tuesday, 5/13, 10:15am Witmer 116 o Problems pulled from o Lecture o HW o exams o We will cover a small amount of new material as we review. New material will be details of old material.
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Motional EMF v B Pos. charges cannot move, Neg. charges shift down. Rod has net pos at top and net neg at bottom. Rod becomes a battery with a V = EMF
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Motional EMF v B If in a circuit, current will flow. V = IR etc. Careful, only the rod can move. Why? Right-hand wire would also have an
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Unformatted text preview: EMF (opposing). Motional EMF v B How big is EMF? Depends on: Velocity EMF = vBL when v, L, and B all 90. B-field Length of rod Units of Volts (or J/Coul) Motional EMF v B Problem solving. Energy conservation! Newtons laws! Work done on bar = energy dissipated in the resistor Force on the bar is balanced if at constant speed (Force of the external agent = mag. Force, IlB. Motional EMF v B What is the force on the bar by the rope if it is pulled at constant a speed of 2m/s through a 3T field? The bar is 0.5m long and the resistor is 5 . Frictionless conducting rails...
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