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Question

In a series RLC circuit that is operating above the resonant frequency, the current

A
lags the applied voltage
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B
leads the applied voltage
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C
is in phase with the applied voltage
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D
is zero
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Solution

The correct option is B lags the applied voltage
Capacitive reactance is given by XC=1wC
Inductive reactance is given by XL=wL
At resonance, XL=XC wL=1wC
But a frequency higher than resonance frequency, XL>XC
So the circuit behaves as a inductive circuit at a frequency higher that resonant frequency and the current lags behind the voltage in an inductive circuit.
Thus option A is correct.

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