In the figure below, the magnetic flux that crosses the indicated turn decreases with time according to the expression OB = 4t + 2t¸ where OB is given in webers and t in seconds. (a) Calculate the modulus of the induced emf in the turn when t=2s; (b) Indicate the direction of current in the spirals, that is, say if it is clockwise or counterclockwise. RXX XXX X X X X/x X X X X x X x x x x x X Xx X x/x X x x xX x X X x Xx [x X X x xlwwwx x CR X X X X x"x x

In the figure below, the magnetic flux that crosses the indicated turn decreases with time according to the expression OB = 4t + 2t¸ where OB is given in webers and t in seconds. (a) Calculate the modulus of the induced emf in the turn when t=2s; (b) Indicate the direction of current in the spirals, that is, say if it is clockwise or counterclockwise. RXX XXX X X X X/x X X X X x X x x x x x X Xx X x/x X x x xX x X X x Xx [x X X x xlwwwx x CR X X X X x"x x

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter31: Gauss’s Law For Magnetism And Ampère’s Law

Section: Chapter Questions

Problem 59PQ: A uniform magnetic field B=5.44104iT passes through a closed surface with a slanted top as shown in...

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The accompanying figure shows a metal disk of inner radius r1 and other radius r2 rotating at an angular velocity while in a uniform magnetic field directed parallel to the rotational axis. The brush leads of voltmeter are connected to the dark's inner and outer surfaces as shown. What is the reading of the voltmeter ?
Two long, parallel wires cy equal currents in opposite directions. The radius of each wire is a, and the distance between the centers of the wires is d, Show that if the magnetic flux within the wires themselves can be ignored, the self-inductance of a length 1 of such a pair of wires is L 0 l in d1 a (Hint Calculate the magnetic flux through a rectangle of length 1 between the wires and then use L=N/I
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Use Lenz’s law to determine tl direction of induced current in each case.
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