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Electromagnetism Physics 100 Chapt 15 Michael Faraday

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General circuit + - Appliance + - Energy source (device that separates + & - charge) I I

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Moving a Conductor in a B-field separates + & - charges I

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Use this to drive an electric circuit + + I + + +

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Moving wire loop in a B field + + v An electric current is “induced” in the loop

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Either the magnet or the loop can move + + v an electric current is “induced” in the loop

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Magnetic flux ( ) thru a loop = BA ┴

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Flux thru a coil of N loops = N BA ┴

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Faraday’s law change in N BA ┴ elapsed time Induced voltage in a circuit = change in elapsed time EMF = “Electro-Motive Force” Michael Faraday

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Rotating coil in B field A ┴ = 0 =0 B

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Rotating coil in B field A ┴ = A coil = maximum B

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Rotating coil in B field A ┴ = 0 (again) = 0 B

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AC voltage

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Lenz’ Law v v B B + + N S the fall produces an induced current the B-field produced by the induced current tries to impede the fall B-field from induced current I

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Lenz’ law An induced voltage always gives rise to an electric current that creates a magnetic field that opposes the influence that produced it.

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Maglev trains

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Maglev

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