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Inductors

Inductors
An inductance of 0.43 mH is smaller than

0.00043 H
0.05 H
430 μH
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

is quartered
doubles
does not change
quadruples

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

16 mV
160 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

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

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Inductors
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is

870 mA
87 mA
337 mA
87 A

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Inductors
The winding resistance of a coil can be increased by

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

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