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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

100 mA
10 mA
1 mA
1 A

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

is quartered
quadruples
does not change
doubles

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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
219 kΩ
66 kΩ
660 kΩ

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Inductors
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then

VR ≥ VL
VL = VR
VL > VR
VL < VR

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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?

78 mA
400 mA
57 mA
91 mA

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Inductors
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is

5.5 mH
less than 5.5 mH
55 mH
less than 0.2 mH

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