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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
  1. n < nr
  2. n = nr
  3. n > nr
  4. n = 0


Solution

The correct option is C 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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