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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.