A coil with a self-inductance of 20 mH has a resistance of 5 Ω. What is the quality factor of the coil?
Q1. A coil with a self-inductance of 20 mH has a resistance of 5 Ω. What is the quality factor of the coil?
Answer: 400
Explanation: The quality factor is given by Q = ωL / R, so it's 400, not 100, 200, or 500.