Answer: Option C. Is in phase with the applied voltage
In a series LCR circuit operating at the resonant frequency, the current is in phase with the applied voltage.
In a series LCR circuit, at resonance
The impedance of the circuit becomes entirely resistive. For a resistive circuit, the current is in phases with the voltage.
The voltage across the inductor at resonance VL=jQV
The voltage across the inductor at resonance VC =-jQV
Where Q is the quality factor of the circuit.
V = VR+VL+VC = VR+jQV-jQV = VR
The complete source voltage appears across the resistor only.
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