An alternating EMF of frequency `(1)/(2pi sqrt(LC))` 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 not 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 circui
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