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Inductors

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

30 mH
45 mH
15 mH
5 mH

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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 ms
48 s
0.48 s

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

16 mV
2.5 mV
1.6 mV
160 mV

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Inductors
An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is

6 V
0 V
12 V
4 V

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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
87 mA
870 mA
87 A

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Inductors
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

1 mA
1 A
10 mA
100 mA

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