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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
1 A
1 mA
100 mA

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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
quadruples
is quartered

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

5 mH
45 mH
15 mH
30 mH

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

160 mV
16 mV
2.5 mV
1.6 mV

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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

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

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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?

66 kΩ
219 kΩ
1.3 MΩ
660 kΩ

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