PHY 2049: Physics IICh. 30 Induction and InductanceSlide 3Slide 4On R-L circuitshittElectromagnetic Osciallations and Alternating CurrentSlide 8The PotentialsAlternating CurrentsSlide 11InductorPHY 2049: Physics IITutoring Center is open in room NPB 1215, M-F 12:00AM -4:00PM. It is free.Ch. 30 Induction and InductanceMagnetic FluxFaraday’s Law of InductionLenz’ lawInductorsSelf and MutualSeries RL circuitsMagnetic EnergyPHY 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?On R-L circuitsWhen the switch S in the circuit shown is closed, the time constant for the growth of current in R2 is:V = L dI/dt +IR2hittThe four wire loops shown have edge lengths of either L, 2L, or 3L. They will move with the same speed into a region of uniform magnetic field B, directed out of the page. Rank them according to the maximum magnitude of the induced emf, least to greatest.A. 1 and 2 tie, then 3 and 4 tie B. 3 and 4 tie, then 1 and 2 tie C. 4, 2, 3, 1 D. 1, then 2 and 3 tie, then 4 E. 1, 2, 3, 43214Electromagnetic Osciallations and Alternating CurrentCurrent changes expo in an R-L circuitCharge changes expo in an R-C circuitSinusoidal in and L-C circuitAnalogous to a harmonic OscilaltortAxdtxdosin222VRIdtdIL The PotentialsCharge up a capacitor, plug in an inductor and unplug battery.Pot across inductor oscillates.The potential across a capacitor oscillates.Alternating CurrentsA resistance 0)sin(sin0sintItRVIIRtVRoAlternating CurrentsCXtXVtItCVdtdqtitCVqCCCoo1)90sin()90sin(cos)(sin0The current leads the voltageInductorThe current lags the
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