How Many Seconds After the Switch in an RL Circuit

question 75

Multiple Choice

How many seconds after the switch in an RL circuit is closed will it take the current i to reach 40% of its steady state value? Express answer in terms of R and L and round coefficient to the nearest hundredth.

• A) 0.92 L/R seconds
• B) 0.51 L/R seconds
• C) 1.12 L/R seconds
• D) 0.71 L/R seconds