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Unformatted text preview: 10/16/11 1 Consider the LC and RC series circuits shown: Suppose that at t =0 the capacitor is charged to a value of Q . Is there is a qualitative difference in the time development of the currents produced in these two cases. Why?? L C C R ++++     ++++     LC Circuits 10/16/11 2 LC Circuit Oscillations Kirchoffs loop rule L C + +   I Q 10/16/11 3 0 I 1 Q 0 1 t 0 I t 1 0 V C 1 V t 0 L 1 LC Circuit Oscillations 10/16/11 4 The other unknowns are found from the initial conditions. Question: Does this solution conserve energy? Oscillation frequency has been found from the loop equation. LC Oscillations: Energy Check = 1 LC 10/16/11 5 U E t U B 0 t Energy in Capacitor Energy in Inductor Therefore, Energy Check: in LC circuit U E ( t ) = 1 2 C Q 2 cos 2 ( t + ) U B ( t ) = 1 2 L 2 Q 2 sin 2 ( t + ) = 1 LC U B ( t ) = 1 2 C Q 2 sin 2 ( t + ) U E ( t ) + U B ( t ) = Q 2 2 C 10/16/11 6 U B versus U E in LC curcuit: Rates and Frequencies: RC, LR and LC Circuits...
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This note was uploaded on 12/04/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue UniversityWest Lafayette.
 Spring '09
 CHANG
 Physics, Charge, Current

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