Question
Question: A resistor R, an inductor L and a capacitor C are connected in series to a source of frequency n. If...
A resistor R, an inductor L and a capacitor C are connected in series to a source of frequency n. If the resonant
requency is nr then the current lags behind voltage, when
A
n = 0
B
n < nr
C
n = nr
D
n > nr
Answer
n > nr
Explanation
Solution
Below resonant frequency the current leads the applied e.m.f., at resonance it is in phase with applied e.m.f. and above resonance frequency it lags the applied e.m.f., Hence (4) is correct.