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INDUCTORS

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

45 mH
5 mH
30 mH
15 mH

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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 A
100 mA
10 mA
1 mA

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Inductors
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?

57 mA
91 mA
78 mA
400 mA

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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 s
0.48 μs
0.48 ms
48 s

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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

32 μH
248 μH
64 μH
8 H

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