An inductor of inductance 2 $\mathrm{\mu H}$ is connected in series with a resistance, a variable capacitor and an AC source of frequency 7 kHz. The value of capacitance for which maximum current is drawn into the circuit $\frac{1}{x}\mathrm{F}$, where the value of $x$ is ___________.

(Take $\pi=\frac{22}{7}$)