A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
A. 91 mA
B. 78 mA
C. 57 mA
D. 400 mA
Answer: Option B
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Related Questions on Electrical Inductors
The winding resistance of a coil can be increased by
A. Increasing the number of turns
B. Using a thinner wire
C. Changing the core material
D. Increasing the number of turns or using thinner wire
A. 1 mA
B. 10 mA
C. 100 mA
D. 1 A
I=86×20/220