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A 250-MH Inductor Is Connected in Series to a 20

Question 9

Multiple Choice

A 25.0-mH inductor is connected in series to a 20.0-Ω resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?


A) 0.800 × 10-3 s
B) 0.800 × 10-2 s
C) 0.500 s
D) 1.25 × 10-3 s
E) 12.5 × 10-2 s

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