Lecture_24_(Cahp.24)

# Lecture_24_(Cahp.24) - Recap Inductance emfbat emf R emf d...

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Recap: Inductance emf at R emf il dt d emf mag bat coil dI N f 2 2 0 dt R d emf Increasing I increasing B dt dI L emf ind L – inductance, or self-inductance 2 emf at R 2 0 R d N L Unit of inductance L : bat emf ind Henry = Volt . second/Ampere Inductance resists changes in current 1

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Recap: Current in RL Circuit 0 dt dI L RI emf battery t L R battery emf e R t I 1 ) ( Time constant : time in which ti l f t d exponential factor drops e times R L 1 t L R 2
Recap: Current in LC Circuit 2 t 0 2 dt Q d LC Q LC Q Q cos 0 dQ dt I Q 0 t Period: LC T 2 I ( t ) LC sin Frequency: f 1/ 2 Non-ideal LC circuit: 0 R inductor capacitor V V V 0 dt dI L RI C Q 3

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Recap: Energy in LC Circuit Initial energy stored in a capacitor: C Q 2 2 At time t= 0: Q=Q 0 C Q U cap 2 2 0 At time t= : Q= 0 LC 2 2 2 1 LI U sol Q 0 aximum current: ystem oscillates: nergy is passed LC I max Maximum current: System oscillates: Energy is passed back and forth between electric and magnetic fields. 4
Question (Chap. 22) A capacitor C was charged and contains charge + Q 0 and – Q 0 on each of its plates, Q 0 respectively. It is then connected to an inductor (coil) L . ssuming the ideal case (wires have no A. There will be no current in the circuit at any time Assuming the ideal case (wires have no resistance) which of the following is true : because of the opposing emf in the inductor. B. The current in the circuit will maximize at time t when the capacitor will have charge Q ( t )=0. C. The current in the circuit will maximize at time t hen capacitor will have full charge when capacitor will have full charge Q ( t )= Q 0. D. The current will decay exponentially. 5

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Two Bulbs Near a Solenoid Varying B is created by AC current in a solenoid hat is the current in this circuit? What is the current in this circuit?
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Lecture_24_(Cahp.24) - Recap Inductance emfbat emf R emf d...

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