Alternating Current

An inductor of \(0.5 \mathrm{~mH}\), a capacitor of \(20 ~\mu \mathrm{F}\) and a resistance of \(20 \Omega\) are connected in series with a \(220 \mathrm{~V}\) a.c. source. If the current is in phase with the e.m.f. the maximum current in the circuit is \(\sqrt{x} A\). The value of '\(x\)' is