Alternating Current

A series LCR circuit with \(R = {{250} \over {11}}\,\Omega\) and \({X_L} = {{70} \over {11}}\,\Omega\) is connected across a 220 V, 50 Hz supply. The value of capacitance needed to maximize the average power of the circuit will be _________ \(\mu\)F. (Take : \(\pi = {{22} \over 7}\))