In the network shown, time constant of the circuit is ς when switches S1 and S2 are open. When S1 and S2 are closed, time constant of the circuit will be
4ς3
2ς3
3ς2
3ς4
ς=LR
when S1 and S2 are closed, Re=R×RR+R=R2 and Le=2L×L2L+L=2L3
∴ς1=2L/3R/2=43ς