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Inductors

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
The winding resistance of a coil can be increased by

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

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Inductors
Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is

64 μH
32 μH
8 H
248 μH

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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

337 mA
870 mA
87 mA
87 A

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Inductors
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

shorted
good
partly shorted
open

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

1.6 mV
16 mV
2.5 mV
160 mV

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