While the frequency of the AC source in a series LCR circuit is gradually increased
PHYSICS · Single correct · CBSE · Physics · Alternating Current · Alternating Current
Problem
While the frequency of the AC source in a series LCR circuit is gradually increased, the circuit reaches its resonant frequency. How does the amplitude of current change when resonance is achieved?
(a) It decreases to a minimum because the reactances cancel.
(b) It remains the same as before because the supply voltage is unchanged.
(c) It increases and attains its maximum value limited only by R.
(d) It becomes zero owing to phase cancellation.