First slide

Phasors and Phasor Diagrams

Question

An AC source of variable frequency f is connected to an LCR series circuit. which one of the graphs in figure represents the variation of current I in the circuit with frequency f ?

Moderate

A
B
C
D

Solution

For frequency $0 - f_{r}$ ,z decreases, hence $I (= V / Z),$ increases. For frequency $f_{r} - \infty,$ z increases, hence I decreases.

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