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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 resistive part

B

The current in the circuit is in phase with the applied e.m.f and the voltage across `R` equal this applied emf

C

The sum of the p.d'a 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 `omega L//R` or `1//omega CR` and this is a measure of the voltage magnification (produced by the circuit at resonance) as well as the sharpness of resonance of the circiut.

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The correct Answer is:
A,B,C
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