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An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance ' \( R \) ' are connected in series to
\( \mathrm{P} \) an ac source of potential difference ' \( V \) ' volts as shown in

W figure.
Potential difference across L, C and R is \( 40 \mathrm{~V}, 10 \mathrm{~V} \) and \( 40 \mathrm{~V} \), respectively. The amplitude of current flowing through LCR series circuit is \( 10 \sqrt{2} \mathrm{~A} \). The impedance of the circuit is:
\( (2021) \)
(a) \( 5 \sqrt{2} \Omega \)
(b) \( 4 \Omega \)
(c) \( 5 \Omega \)
(d) \( 4 \sqrt{2} \Omega \)
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