In the circuit shown, initially keys K1, K2 and K3 are all open. Now certain events as described below are performed successively on the circuit which involve closing and opening of the keys K1, K2 and K3.
Event 1: Keys K1 and K2 are closed and K3 is left open.
Event 2: After a long time K2 is opened and K3 is closed.
Event 3: After a long time K1 is opened and K2 is closed.
The time constants for charging of capacitor (completion of Event 1) and rise of current through the inductor (completion of Event 2) respectively are