A series LR circuit includes a 9.00 V battery,a 30.0 mH inductor,and a resistance of 5.00 $\Omega$.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 $\Omega$.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) of an LR circuit is given by the equation:

τ = L/R

where L is the inductance and R is the resistance.

In this case, L = 30.0 mH = 0.030 H and R = 5.00 Ω

So, τ = 0.030 H / 5.00 Ω = 0.006 s = 6.00 ms

Therefore, the best choice is D) 6.00 ms.

A Series LR Circuit Includes a 9 Ω\OmegaΩ What Is the Time Constant of This Circuit? A)

A Series LR Circuit Includes a 9 $\Omega$ What Is the Time Constant of This Circuit?
A)