RLC Circuits and Resonance - General Questions (2)

A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is

A 90  resistor, a coil with 30  of reactance, and a capacitor with 50  of reactance are in series across a 12 V ac source. The current through the resistor is

If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth

Referring to Problem 8, the total current is

A 200  resistor, a coil with 30  of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance

Referring to Problem 20, what is the total parallel resistance (R_p(tot))?

A 6.8 k resistor, a 7 mH coil, and a 0.02 F capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, R_W, is 30 . The equivalent parallel resistance, R_p(eq), is

The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 F, and R_W = 90  is