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Inductors

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

30 mH
45 mH
5 mH
15 mH

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Inductors
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

less than 0.6 mH
9.9 mH or greater than 5 mH
greater than 5 mH
9.9 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
337 mA
87 mA
87 A

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Inductors
The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately

6.9 μH
14 μH
2.2 μH
155 μH

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Inductors
A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?

0.48 μs
0.48 s
0.48 ms
48 s

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Inductors
The inductance of an iron-core coil decreases if

None of these
the length of the coil decreases
the iron core is removed
the number of turns is decreased

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