A series LR circuit includes a 9.00 V battery, a 30.0 mH inductor, and a resistance of 5.00 Ω. What is the time constant of this circuit?
A) 115 s
B) 170 s
C) 4.20 ms
D) 6.00 ms
E) 8.30 ms

Question

A series LR circuit includes a 9.00 V battery, a 30.0 mH inductor, and a resistance of 5.00 Ω. What is the time constant of this circuit? 
A) 115 s 
B) 170 s 
C) 4.20 ms 
D) 6.00 ms 
E) 8.30 ms

Quizplus · Accepted Answer

The time constant (τ) for a series LR circuit is given by τ = L/R, where L is the inductance and R is the resistance. Plugging in the given values, τ = (30.0 mH)/(5.00 Ω) = 6.00 ms. Therefore, the answer is D.

A Series LR Circuit Includes a 9