JEE AdvancedAlternating CurrentHard

Question

An alternating EMF of frequency is applied to a series LCR circuit. For this frequency of the applied EMF,

Options

A.The circuit is at ′resonance′ and its impedance is made up only of a reactive part
B.The current in the circuit is in phase with the applied EMF and the voltage across R equals this applied EMF potential differences
C.The sum of the potential differences across the inductance and capacitance equals the applied EMF which is 180o ahead of phase of the current in the circuit
D.The quality factor of the circuit is ωL/R or 1/ωCR and this is a measure of the voltage magnification (produced by the circuit at resonance) as well as the sharpness of resonance of the circuit

Solution

Circuit is at Resonance so impedente is only resistive

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