Since both voltage and current of the circuit are in the same phase, the circuit is purely resistive. So,impedance of the circuit, Z=R=`5Omega`
Frequency of the resonent circuit ,
`f=1/(2pisqrt(LC))`
`thereforeC=1/(4pi^2Lf^2)=49/(4times484times50times10^-3times50times 50)`
`=2.03times10^-4F`