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Inductors

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

1.6 mV
16 mV
160 mV
2.5 mV

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

doubles
increases
decreases
remains the same

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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

9.9 mH
less than 0.6 mH
9.9 mH or greater than 5 mH
greater than 5 mH

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

5 mH
15 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

VR ≥ VL
VL > VR
VL < VR
VL = VR

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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 ms
0.48 s
0.48 μs
48 s

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