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Question

A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency n. If the resonant frequency is , then the current lags behind voltage, when

A
n = 0
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B
n< nr
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C
n= nr
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D
n> nr
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Solution

The correct option is D n> nr

The current will lag behind the voltage when reactance of inductance is more than the reactance of condenser. Thus, ωL> 1wC or ω> 1LC or n> 12πLC or n> nr where nr= resonant frequency


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