A coil of 40 henry inductance is connected in series with a resistance of 8 ohm

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and of a 2 volt battery. The time constant of the circuit is

(a) 5 sec
(b) 1/5 sec
(c) 40 sec
(d) 20 sec

5 sec

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