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A LCR series circuit behaves like a pure resistive circuit at an angular frequency 50 kHz. If the angular frequency is made 45kHz then

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current is in phase with emf

current lags the emf

current will be maximum possible

current leads the emf

answer is B.

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Detailed Solution

At 50 kHz, $L ω = \frac{1}{ω C}$
$\Rightarrow$ For 45 kHz X_L decreases and X_C increases
$\Rightarrow$ Current leads voltage

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