The RL circuit has a 12 V battery and a 25 ohm resistor. The time constant for the circuit is 3.8 X 10 -3 seconds.

The RL circuit has a 12 V battery and a 25 ohm resistor. The time constant for the circuit is 3.8 X 10-3 seconds.

A)calculate the inductance of this circuit

b) find the current in the circuit a long time after the switch was closed

C) at what time is the current 0.2 A