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 22 I CL Q UU 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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Lecture%2027%202220%20Spring%2020090 - Reminders and...

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