A resistor R, an inductor L and a capacitor C are connected in series to an osci

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

Options:

A . n = 0

B . n

C . n= nr

D . n> nr

Answer: Option D
:
D
The current will lag behind the voltage when reactance of inductance is more than the reactance of condenser. Thus,

ω L > \frac{1}{w C}

ω > \frac{1}{\sqrt{L C}}

n > \frac{1}{2 π \sqrt{L C}}

n > n_{r}

where

n_{r}

= resonant frequency

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