clicker20 - 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)
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2 The angle between the normal and the field. 20.2 Faraday’s Law Emf = Change in magnetic Flux/Time i f i f t t N t N Since = B A cos( ), 3 things can change 1. Area of loop A 2. Magnetic field B 3. Angle between A and B t N | | Forget about the “-” sign , and use
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3 Change of Area Change of B (at the position of the loop) Example
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4 20.3 Motional EMF Bv 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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clicker20 - Chapter 20 Induced Voltages and Inductance 20.1...

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