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Lecture%2027%202220%20Spring%2020090 - Reminders and...

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1 Reminders and Announcements HW 16 is due Friday; HW 17 is due next Tuesday. • No quiz this week but some of recitation No quiz this week, but some of recitation time will be used for course evaluation. We will be grading the exams early next week. Help Room Hours (Physics 117): – M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 LC Circuits A capacitor is connected to an inductor in an LC circuit • Assume the capacitor is Assume the capacitor is initially charged and then the switch is closed Assume no resistance and no energy losses to radiation Oscillations in an LC Circuit Under the previous conditions, the current in the circuit and the charge on the capacitor oscillate between maximum positive and negative values With zero resistance, no energy is transformed into internal energy Ideally, the oscillations in the circuit persist indefinitely The idealizations are no resistance and no radiation Oscillations in an LC Circuit, The total energy stored in the LC circuit remains constant in time and equals 2 2 1 2 2 I C L Q U U U L C = + = + LC Circuit Analogy to Spring- Mass System Charge and Current in an LC Circuit
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2 Energy in an LC Circuit – Graphs The energy continually oscillates between the energy stored in the electric and magnetic fields When the total energy is stored in one field,
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