## 21. 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?

## 22. In a series RLC circuit, the current is minimum at resonance.

## 23. A series resonant circuit is commonly called a tank circuit.

## 24. 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 f_{r} is

_{r}is