PHY 2049: Physics IIExam IIhittCh. 30 Induction and InductanceSlide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12PHY 2049: summarySlide 14PHY 2049: Physics IITutoring Center is open in room NPB 1215, M-F 12:00AM -4:00PM. It is free.Exam IIhittA square loop of current-carrying wire with edge length a is in the xy plane, the origin being at its center. Along which of the following lines can a charge move without experiencing a magnetic force? A. x = 0, y = a/2 B. x = a/2, y = a/2 C. x = a/2, y = 0 D. x = 0, y = 0, E. x = 0, z = 0Ch. 30 Induction and InductanceMagnetic FluxFaraday’s Law of InductionLenz’ lawInductorsSelf and MutualSeries RL circuitsMagnetic EnergyPHY 2049: Physics IIFaraday’s Law:Electric generatorsElectric guitarsEngine starters, cars, scooters etc.Induction stovesThe basic idea: When a magnetic field changes in time, it produces an electric fieldPHY 2049: Physics IISome concepts:Faraday’s lawLenz’ law: the kickbacktVdlEVdABBB..PHY 2049: Physics IIThings that matterPoleDirection of motionPHY 2049: Physics IISeen From leftSwitch turned onSwitch turned ofPHY 2049: Physics IISelf inductancePHY 2049: Physics IISelf inductanceNΦB = LiAnalogously mutual inductance.PHY 2049: Physics II RLeReidtdiLiReLRt/1/PHY 2049: Physics IIWhen the switch is first thrownThe inductors block any current. All current flows through the middle resistance. I = V/RLater, the inductors are all closed and the current is then I = 3V/R.How much time does it take for the current to rise?PHY 2049: summaryFaraday’s LawV = -dΦ/dtLenz’ Law the minus sign Inductance self and mutualV = L dI/dtTime evolution of currentTime constant t =
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