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Inductors

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

30 mH
5 mH
45 mH
15 mH

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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
78 mA
400 mA
91 mA

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Inductors
A 240 H inductor is equivalent to a

0.240 mH inductor
240 mH inductor
240 H inductor
0.000240 mH inductor

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Inductors
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field

doubles
is quartered
does not change
quadruples

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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
248 μH
8 H

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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
87 A
337 mA

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