The circuit shown below is under steady-state condition

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The circuit shown below is under steady-state condition with the switch closed. The switch is opened at t = 0. What is the time constant of the circuit?

1. 0.1 s
2. 0.2 s
3. 5 s
4. 10 s

Correct Option: B

Time constant

τ =	L	=	2H
	R		10Ω

or τ = 0.2s.