For the circuit shown below, $=20V,L=10\mathrm{.}0H,$ and $R=5\mathrm{.}0.$

$*$Report all answers to $2$ S$.$F and include the zero before the decimal when the value is less tha

A$)$ The Time Constant is $$ s$.$

B$)$ The current when the circuit reaches a steady state is $$ amps.

C$)$ The current $0\mathrm{.}5$ s after the switch is closed is $$

D$)$ The time is takes to reach $50\%$ current is $$