What will be the self inductance of a coil, to be connected in a series with a  resistance of  $\mathrm{\pi }\sqrt{3}\mathrm{\Omega }$ such that the phase difference between the emf and the current at 50 Hz frequency is 30° 

• A

  0.5 Henry

• B

  0.03 Henry

• C

  0.05 Henry

• D

  0.01 Henry