Answer: omega_0 L/R.
- A omega_0 L/R
- B R/(omega_0 L)
- C omega_0/(LC)
- D L/(omega_0 RC)
Correct answer: A. omega_0 L/R
Explanation: Q = omega_0 L/R = 1/(omega_0 CR). High Q means sharp resonance, less energy loss per cycle.
In a pure inductor the current lags the voltage by 90° (energy is briefly stored in the magnetic field before current responds); in a pure capacitor the current leads the voltage by 90° (current must flow to build up charge before voltage rises) - the mnemonic "ELI the ICE man" keeps these straight.
Concept context
AC circuits, impedance, LCR series circuit, resonance, transformers, and power factor.