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 ( resonance frequency), Z decreases, hence, (I = V/Z) increases and for frequency $f_{r} - \infty$ , Z increases, hence, I decreases.

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