A coil of inductance 300 mH and resistance $2\Omega$ is connected to a source of voltage 2V. The current reaches half of its steady state value in

Question

$\begin {array} {1 1} (A)\;0.05s & \quad (B)\;0.1s \\ (C)\;0.15s & \quad (D)\;0.2s \end {array}$