First slide

AC Circuits

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 of current I in the circuit with frequency f

Moderate

A
B
C
D

Solution

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 decrees.

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