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873_Physics ProblemsTechnical Physics

873_Physics ProblemsTechnical Physics - 31 Faradays Law...

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31 CHAPTER OUTLINE 31.1 Faraday’s Law of Induction 31.2 Motional emf 31.3 Lenz’s Law 31.4 Induced emf and Electric Fields 31.5 Generators and Motors 31.6 Eddy Currents 31.7 Maxwell’s Equations Faraday’s Law ANSWERS TO QUESTIONS Q31.1 Magnetic flux measures the “flow” of the magnetic field through a given area of a loop—even though the field does not actually flow. By changing the size of the loop, or the orientation of the loop and the field, one can change the magnetic flux through the loop, but the magnetic field will not change. Q31.2 The magnetic flux is Φ B BA = cos θ . Therefore the flux is maximum when B is perpendicular to the loop of wire and zero when there is no component of magnetic field perpendicular to the loop. The flux is zero when the loop is turned so that the field lies in the plane of its area. Q31.3 The force on positive charges in the bar is F v B = × q a f . If the bar is moving to the left, positive charge will move downward and
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