Self Inductance, Transformers, and Circuits Containing Inductors

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Self Inductance, Transformers, and Circuits Containing Inductors

Today we finished up chapter 22 and began chapter 23.

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The University of Vermont
Phys 012 - Elementary Physics
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Lecture 17 Outline of Last Lecture I. Problem: A conductive metal bar of mass m, making contact with an electric circuit with resistance R, is falling straight downward. Find an expression for the terminal velocity of the bar, assuming no air resistance, resistance within the circuit wires, and no friction between the bar and the wires. a. ΦB = ΣBΔAcosθ b. As bar falls, Iind. is counter clockwise. c. Forces acting on bar: FB oriented upward, Fgrav. oriented downward. i. FB = ILB ii. Fgrav. = mg d. ΣF = ILB – mg = ma; a = (ILB)/m – g e. εind. = -N (ΔΦB/Δt) = -BLv f. Iind. = |εind.|/R = (BLv)/R g. a = {[(BLv)/R]LB}/m – g = {B2L2v}/Rm – g h. At terminal velocity, a = 0. i. {B2L2v}/Rm – g = 0 ii. v = (gRm)/( B2L2) II. Self-Inductance *switch has just been closed PHYS 012 1st Edition

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