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Inductors

Inductors
Three 15 mH inductors are in series. The total inductance is

5 mH
15 mH
45 mH
30 mH

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Inductors
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?

57 mA
78 mA
400 mA
91 mA

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Inductors
The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately

155 μH
2.2 μH
14 μH
6.9 μH

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Inductors
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

good
shorted
partly shorted
open

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Inductors
An inductance of 0.43 mH is smaller than

43 μH
0.05 H
0.00043 H
430 μH

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Inductors
An inductance of 0.08 μH is larger than

0.00008 mH
0.000008 H
0.000000008 H
0.0000008 H

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