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Inductors

Inductors
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is

16 mV
1.6 mV
160 mV
2.5 mV

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Inductors
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

219 kΩ
66 kΩ
660 kΩ
1.3 MΩ

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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
400 mA
78 mA
91 mA

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Inductors
An inductance of 0.08 μH is larger than

0.000000008 H
0.000008 H
0.00008 mH
0.0000008 H

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Inductors
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

less than 0.6 mH
greater than 5 mH
9.9 mH
9.9 mH or greater than 5 mH

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Inductors
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

100 mA
1 A
1 mA
10 mA

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