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An alternating EMF of frequency (1)/(2pi...

An alternating EMF of frequency `(1)/(2pi sqrt(LC))` is applied to a series LCR circuit. For this frequency of the applied EMF,

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 e.m.f. and the voltage across R equals this applied emf

C

The sum of the p.d.’s across the inductance and capacitance equals the applied e.m.f. which is `180^(@)` ahead of phase of the current in the circuit

D

The quality factor of the circuit is `omegaL//R` or `1//omegaCR` 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

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