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# phy20 - 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 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 F = B A is angle between normal and B B B Magnetic flux F B A cos( )

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2 For HW: 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 F F F 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 F | | Forget about the “-” sign , and use
3 Change of B (at the position of the loop) More examples of changing flux ABcos Your bike light

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4 F = q v B + v + - - + E = /L; F = qE = q /L If q /L = q v B = vBL , it reaches an equilibrium (final
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phy20 - Chapter 20 Induced Voltages and Inductance 20.1...

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