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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
2.5 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
An inductance of 0.43 mH is smaller than

0.05 H
430 μH
0.00043 H
43 μH

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Inductors
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field

does not change
doubles
is quartered
quadruples

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Inductors
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

momentarily goes to zero
is decreased
does not change
is increased

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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?

660 kΩ
1.3 MΩ
219 kΩ
66 kΩ

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