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Unformatted text preview: Section: ______ Name: ______________________________ Section Instructor: ______________________________ Physics 2208, Spring 2009 1 Cornell University Assignment 7: Electromagnetic (EM) Oscillations and Waves Concepts: LC circuit oscillations damped oscillations in an RLC circuit induced electric fields displacement current Maxwells equations electromagnetic (EM) waves intensity of EM waves polarization of EM waves Reading in text: Chapter 31: Sections 1-7. Chapter 30: Section 6. Chapter 32: Sections 3-5. Chapter 33: Sections 1-3, 5-7. Assignment: Quiz may be given on Tuesday March 24 or Wednesday March 25. Due in lecture on Monday March 23. 1. In the circuit shown, the capacitance C = 010 . F . The switch S is initially open, and the capacitor is charged to 10 V. Except as noted in part (e) below, ignore the resistance of the wires, the resistance of the inductor, and any energy radiated from the circuit. C L S + (a) What value of inductance L is needed for the frequency of electrical oscillations to be 10 kHz after the switch is closed? (b) What is the maximum current that will subsequently flow in the circuit after the switch is closed? (c) What is the maximum magnetic energy stored in the inductor after the switch is closed? (d) At time the switch is closed. Draw graphs of the following quantities as functions of time from t to t = t = T t 2 ms 2 . = = , where T is the period. (Please place your graphs above or below one another with their time axes synchronized. Axes for graphs are provided on pages 3-4.) (i) The charge q t on the capacitor. ( ) (ii) The electric current i t...
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- Spring '08
- Electric Fields