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Inductors

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

2.5 mV
16 mV
1.6 mV
160 mV

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Inductors
The inductance of an iron-core coil decreases if

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

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

15 mH
5 mH
45 mH
30 mH

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Inductors
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then

VL < VR
VL = VR
VL > VR
VR ≥ VL

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Inductors
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field

increases
doubles
decreases
remains the same

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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
87 A
870 mA

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