The quality factor of series R-L-C circuit will increase if
- A. R decreases
- B. R increases
- C. Voltage increases
- D. Voltage decreases
Answer: A. R decreases
Explanation: The quality factor $Q$ for a series R-L-C circuit is inversely proportional to resistance ($Q = \frac{1}{R}\sqrt{\frac{L}{C}}$). Thus, decreasing R increases the quality factor.