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13. The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 μF, and R_{w} = 90 Ω is ________.
(a) 0 Ω
(b) 90 Ω
(c) 20 kΩ
(d) 40 kΩ
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 RLC Circuits » Exercise  1 1. A 10 Ω resistor, a 90 mH coil, and a 0.015 μF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is ________. (a) 1,616 Ω (b) 161 Ω (c) 3,387 Ω (d) 1,771 Ω 2. A 12 Ω resistor, a 40 μF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is ________. (a) 28.1 Hz (b) 281 Hz (c) 2,810 Hz (d) 10 kHz 3. A 15 Ω resistor, a 220 μH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit? (a) 138 MHz (b) 10,866 Hz (c) 1,907 Hz (d) 138 kHz 4. In a series RLC circuit that is operating above the resonant frequency, the current ________. (a) lags the applied voltage (b) leads the applied voltage (c) is in phase with the applied voltage (d) is zero 5. A resistor of 3 kΩ, a 0.05 μF capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form? (a) 636 Ω (b) 3,769 Ω (c) 433 Ω (d) 4,337 Ω 6.…