In a series RL circuit, the time constant τ is:

A RC

B L/R (inductance divided by resistance)

C RL

D R/L

✓ Correct Answer: Option B

RL time constant: τ = L/R. RC: τ = RC. After 5τ, transient response is essentially complete (~99.3%).

💡 Why is B) the correct answer?

The correct answer to the question "In a series RL circuit, the time constant τ is:" is Option B: L/R (inductance divided by resistance).

The other options — A) RC, C) RL, D) R/L — are incorrect for this FE Exam Prep question. As explained above: RL time constant: τ = L/R. RC: τ = RC. After 5τ, transient response is essentially complete (~99.3%).

📚 About This FE Exam Prep Practice Question

This 2-level FE Exam Prep question from the Electrical Circuits topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free FE Exam Prep practice test or use flashcards for spaced repetition review.

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In a series RL circuit, the time constant τ is:

✓ Correct Answer: Option B

📚 About This FE Exam Prep Practice Question

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