A resistor \( R \), an inductor \( \mathrm{L} \) and a capacitor \(...

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A resistor \( R \), an inductor \( \mathrm{L} \) and a capacitor \( \mathrm{C} \) are connected in series to an oscillator of frequency \( v \). If the resonant frequency is \( U_{r} \), then the current lags behind voltage, when :
(A) \( v=0 \)
(B) \( \cupv r \)
(C) \( v=v r \)
(D) \( vv r \)
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