Topic: Network Theory
In a series resonant circuit, with the increase in L
- A. Resonant frequency will decrease
- B. Bandwidth will decrease
- C. Q will increase
- D. All of these
Answer: D. All of these
Explanation: With an increase in inductance L: (1) Resonant frequency $f_{r} = \frac{1}{2\pi\sqrt{LC}}$ decreases. (2) Bandwidth $\frac{R}{L}$ decreases. (3) Quality factor $Q = \frac{1}{R}\sqrt{\frac{L}{C}}$ increases. Therefore, all the given statements are correct.