A coil of 40 H inductance is connected in series with a resistance of 8\[\Omega \] and this combination is connected to the terminals of a 2V battery. The inductive time constant of the circuit is (in seconds)
A) 40
B) 20
C) 5
D) 0.2
Correct Answer:
C
Solution :
Time constant of L-R circuit \[t=\frac{L}{R}=\frac{40}{8}=5s\]