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Electromagnetism Physics 100 Chapt 15 Michael Faraday
General circuit + - Appliance + - Energy source (device that separates + & - charge) I I
Moving a Conductor in a B-field separates + & - charges I
Use this to drive an electric circuit + + I + + +
Moving wire loop in a B field + + v An electric current is “induced” in the loop
Either the magnet or the loop can move + + v an electric current is “induced” in the loop
Magnetic flux ( ) thru a loop = BA ┴
Flux thru a coil of N loops = N BA ┴
Faraday’s law change in N BA ┴ elapsed time Induced voltage in a circuit = change in elapsed time EMF = “Electro-Motive Force” Michael Faraday
Rotating coil in B field A ┴ = 0 =0 B
Rotating coil in B field A ┴ = A coil = maximum B
Rotating coil in B field A ┴ = 0 (again) = 0 B
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
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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