Chapt34_VG - The electromotive force comes from the Lorenz...

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Chapter 34 Viewgraphs
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Faraday s Discovery A current in a coil is induced if the magnetic field through the coil is changing in time. The current can be induced two different ways: 1. By changing the size, orientation or location of the coil in a steady magnetic field. 2. By changing in time the strength of the magnetic field while keeping the coil fixed. Both cases can be described by the same law: The “electromotive force” equals the rate of change of magnetic flux. EMF = d dt Φ
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The current can be induced two different ways: 1. By changing the size, orientation or location of the coil in a steady magnetic field.
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Unformatted text preview: The electromotive force comes from the Lorenz force. Motional EMF 2. By changing in time the strength of the magnetic field while keeping the coil fixed. The electromotive force comes from the electric field. This requires saying that electric fields can appear that do not satisfy Coulombs Law! Motional EMF loop ! E + ! v ! B ( ) " d ! S =-d dt = d dt ! B d ! A Area Faradays Law for Moving Loops Faradays Law for Stationary Loops loop ! E d ! S " == ! B t d ! A Area...
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Chapt34_VG - The electromotive force comes from the Lorenz...

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