RLC Circuits and Resonance - General Questions (3)

A 12  resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is

A resistor of 3 k, a 0.05 F 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 15  resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

In a series RLC circuit that is operating above the resonant frequency, the current

A 10  resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below f_r is