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Question: Answered & Verified by Expert
A coil of 40 henry inductance is connected in series with a resistance of $8 \mathrm{ohm}$ and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is:
PhysicsElectromagnetic InductionJEE Main
Options:
  • A 5 seconds
  • B 1/5 seconds
  • C 40 seconds
  • D 20 seconds
Solution:
1327 Upvotes Verified Answer
The correct answer is: 5 seconds
According to the question Time constant $L R$ circuit is $T=\frac{L}{P}$
$$
\therefore \quad T=5 \mathrm{sec}
$$

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