In a series circuit the current leads the applied voltage when driven at angular frequency
PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
In a series LCR circuit the current leads the applied voltage when driven at angular frequency ωx, while the current attains its maximum value at the resonant frequency ω0. The magnitude of current at ωx is found to be exactly 21 times the maximum value at resonance.
(i) State whether ωx is less than ω0 or greater than ω0.
(ii) Explain your answer using the phase relationship between current and voltage on either side of resonance.
(iii) Identify, with reasoning, whether ωx corresponds to the lower or the upper half-power frequency.