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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 I in the circuit with frequency f

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a

b

c

d

answer is D.

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Detailed Solution

For frequency 0 – fr ( resonance frequency), Z decreases, hence, (I = V/Z) increases and for frequency fr-∞, Z increases, hence, I decreases.
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