Q. A coil of inductance $40\ henry$ is connected in series with a resistance of $8\ ohm$ and the combination is joined to the terminals of a $2\ volt$ battery. The time constant of the circuit is
A) $40\ seconds$
B) $20\ seconds$
C) $8\ seconds$
D) $5\ seconds$
Explanation
(d) Time constant $= \frac{L}{R} = \frac{40}{8} = 5\ \sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.