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SG_Chap20

# SG_Chap20 - Chapter 20 Induced Voltages and Inductance 20.1...

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1 Chapter 20 Induced Voltages and Inductance 20.1 Induced emf (voltage) and magnetic flux Moving charges can generate a magnetic field Can a magnetic field make charges move (current)? A moving magnet can induce electric currents, which can be used to control things Cruise controls and anti-lock breaks all involve magnets in motion Magnetic flux Count number of field lines through loop A Magnetic flux = B A is angle between normal and B B B Magnetic flux B A cos( ) SI units of flux are T . m² = Wb (Weber) Reading Assignment: The angle between the normal and the field. Examples (B = 1 T, A = 0.5 m 2 ) 20.2 Faraday’s Law Emf = Change in magnetic Flux/Time i f i f t t N t N Since F= B A cos( ), 3 things can change F 1. Area of loop 2. Magnetic field B 3. Angle between A and B t N | | Forget about the “ - ” sign , and use

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2 Change of Area Change of B (at the position of the loop) 20.3 Motional EMF B v B v and I R 20.4 Lenz’s Law Lenz’s Law: No change of flux, please, or else I am going to oppose it!!!
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