In a circuit \( \mathrm{L}, \mathrm{C} \) and \( \mathrm{R} \) are connected in series with an a....

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In a circuit \( \mathrm{L}, \mathrm{C} \) and \( \mathrm{R} \) are connected in series with an alternating voltage source of frequency \( f \). The
\( \mathrm{P} \)
current leads the voltage by \( 45^{\circ} \). The value of \( \mathrm{C} \) is :-
(1) \( \frac{1}{2 \pi f(2 \pi f L-R)} \)
(2) \( \frac{1}{2 \pi f(2 \pi f L+R)} \)
(3) \( \frac{1}{\pi f(2 \pi f L-R)} \)
(4) \( \frac{1}{\pi f(2 \pi f L+R)} \)


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