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Q.

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

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a

b

c

d

answer is D.

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Detailed Solution

As explained in solution (1) for frequency 0−fr, Z decreases hence (i=V/Z), increases and for frequency fr−∞, Z increases hence i decrees.

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