Two identical series LCR circuits are excited at angular frequencies and such that
PHYSICS · Single correct · CBSE · Physics · Alternating Current · Alternating Current
Problem
Two identical series LCR circuits are excited at angular frequencies ω1 and ω2 such that ω1<ω0<ω2, where ω0 is the circuit’s resonant frequency. Which statement correctly describes the sign of (XL−XC) and the effective nature of the circuit at these two frequencies?
(a) At ω1 the circuit is capacitive with (XL−XC)<0; at ω2 it is inductive with (XL−XC)>0.
(b) At ω1 the circuit is inductive with (XL−XC)>0; at ω2 it is capacitive with (XL−XC)<0.
(c) Both ω1 and ω2 make (XL−XC) positive so the circuit is inductive at both frequencies.
(d) (XL−XC)=0 at both ω1 and ω2, so the circuit behaves purely resistive in each case.