MCQ
In a series $\text{RLC}$ circuit that is operating above the resonant frequency, the current.
- ✓lags the applied voltage
- Bleads the applied voltage
- Cis in phase with the applied voltage
- Dis zero
✓
Answer
Correct option: A.
lags the applied voltage
Capacitive reactance is given by. $\text{X}_\text{C}=\frac{1}{\text{wC}}$
Inductive reactance is given by $\text{X}_\text{L}={\text{wL}}$
At resonance, $\text{X}_\text{L}={\text{X}_\text{C}}\Rightarrow \text{w}\text{L}=\frac{1}{\text{wC}}$
But a frequency higher than resonance frequency, $X_L>X_C$
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.
Inductive reactance is given by $\text{X}_\text{L}={\text{wL}}$
At resonance, $\text{X}_\text{L}={\text{X}_\text{C}}\Rightarrow \text{w}\text{L}=\frac{1}{\text{wC}}$
But a frequency higher than resonance frequency, $X_L>X_C$
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.
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