A 140-mH inductor and a 4.90-Ω resistor are connected with a switch to a 6.00-V battery as

Question:

A 140-mH inductor and a 4.90-Ω resistor are connected with a switch to a 6.00-V battery as shown in Figure P32.27.
(a) If the switch is thrown to the left (connecting the battery), how much time elapses before the current reaches 220 mA?
(b) What is the current in the inductor 10.0 s after the switch is closed?
(c) Now the switch is quickly thrown from a to b. How much time elapses before the current falls to 160 mA?

A 140-mH inductor and a 4.90-Ω resistor