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Inductors

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

10 mA
100 mA
1 mA
1 A

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

16 mV
2.5 mV
1.6 mV
160 mV

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Inductors
The winding resistance of a coil can be increased by

changing the core material
using a thinner wire
increasing the number of turns or using thinner wire
increasing the number of turns

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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
An inductance of 0.08 μH is larger than

0.00008 mH
0.0000008 H
0.000000008 H
0.000008 H

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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?

1.3 MΩ
66 kΩ
219 kΩ
660 kΩ

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