An a.c 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
Text Solution
Verified by ExpertsThe correct answer is:
D
Current through the circuit is given by 
,
where, 
From the above equation at 
As frequency increases Z decreases therefore the current, I increases
When, 
(resonant frequency) Z becomes minimum & I becomes maximum
For 
starts increasing and current I goes on decreasing
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