31CHAPTER OUTLINE31.1Faraday’s Law of Induction31.2Motional emf31.3Lenz’s Law31.4Induced emf and ElectricFields31.5Generators and Motors31.6Eddy Currents31.7Maxwell’s EquationsFaraday’s LawANSWERS TO QUESTIONSQ31.1Magnetic flux measures the “flow” of the magnetic fieldthrough a given area of a loop—even though the field does notactually flow. By changing the size of the loop, or theorientation of the loop and the field, one can change themagnetic flux through the loop, but the magnetic field will notchange.Q31.2The magnetic flux is ΦBBA=cosθ. Therefore the flux ismaximum when Bis perpendicular to the loop of wire and zerowhen there is no component of magnetic field perpendicular tothe loop. The flux is zero when the loop is turned so that thefield lies in the plane of its area.Q31.3The force on positive charges in the bar is FvB=×qaf. If the baris moving to the left, positive charge will move downward and
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .