For a given series LCR circuit it is found that maximum current is drawn when value of variable capacitance is 2.5 nF. If resistance of 200 Ω and 100…

For a given series LCR circuit it is found that maximum current is drawn when value of variable capacitance is $\displaystyle 2.5$ nF . If resistance of $\displaystyle 200 \Omega$ and $\displaystyle 100$ mH inductor is being used in the given circuit. The frequency of ac source is $\displaystyle \_\_\_\_$ $\displaystyle \times 10^3 \mathrm{~Hz}$. (given $\displaystyle \pi^2=10$ )