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 resonace and its impedence 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 e.m.f.
C. the sum of the potential differences 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//LR` and is a measure of the voltage magnification produced by the circuit at resonance.

Answer

B