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7. (40 POINTS) An LRC series circuit is driven by a voltage source ε.coset, where ε,-10.0 V. R 140.0 ohms and C-1.0 μF. Note: 1.0 μF-10. 6 F. The circuits resonant frequency is co- 6.28 x 10 3 rad/s. (a) (5) If the resistor value R is doubled, would the resonant frequency change? Yes or No Circle one. EXPLAIN (b) (5) What is the inductance L? (c) (5) If the voltage source frequency ω = ω then what is the value of the impedance Z? (d) (5) If the voltage source frequency o then what is the value of current amplitude I? (e) (10) What is the value of the current amplitude when the source frequency is o /2? (f) (6) At the frequency of part (e ), what is the average power dissipated in the resistor? (g) (4) At the frequency of part (e ), does the current lead or lag the applied voltage? EXPLAIN. You may use a phasor diagram as shown in class to illustrate your answer.
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