Q. An ac source of variable frequency $f$ is connected to an $LCR$ series circuit. Which of the graphs in figure represents the variation of current $I$ in the circuit with frequency $f$
A)
B)
C)
D)
Explanation
(d) As explained in solution (1) for frequency $0 - f_{r},\ Z$ decreases hence $(i = V/Z)$ increases and for frequency $f_{r} - \infty,\ Z$ increases hence $i$ decreases
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.