In an ac circuit, an inductor, a capacitor and a resistor are connected in series with \( X_{L}=...

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In an ac circuit, an inductor, a capacitor and a resistor are connected in series with \( X_{L}=R=X_{C} \).
\( \mathrm{P} \)
Impedance of this circuit is
W
(1) zero
(2) \( R \)
(3) \( R \sqrt{2} \)
(4) \( 2 R^{2} \)
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