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An A.C circuit contains a resistor 'R' a...

An `A.C` circuit contains a resistor `'R'` an inductor `'L'` and a capacitor `'C'` connected in series. When it is connected to an `A.C` generator of fixed output voltage and varialbe frequency, the current in the circuit is found to be leading the applied voltage `(pi)/(4)` read, when the frequency is `f_(1)`. when the frequency of the generator increased to `f_(2)` the current is found to be lagging behind the applied voltage by `(pi)/(4)` rad. The resonant frequency of the circuit is

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