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Inductors
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is
2.5 mV
16 mV
160 mV
1.6 mV
2.5 mV
16 mV
160 mV
1.6 mV
Answer
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Related Question
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
0 V
4 V
6 V
12 V
0 V
4 V
6 V
12 V
Answer
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Inductors
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
doubles
increases
remains the same
decreases
doubles
increases
remains the same
decreases
Answer
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Inductors
The inductance of an iron-core coil decreases if
the length of the coil decreases
the iron core is removed
None of these
the number of turns is decreased
the length of the coil decreases
the iron core is removed
None of these
the number of turns is decreased
Answer
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Inductors
An inductance of 0.08 μH is larger than
0.000008 H
0.00008 mH
0.0000008 H
0.000000008 H
0.000008 H
0.00008 mH
0.0000008 H
0.000000008 H
Answer
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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
57 mA
78 mA
400 mA
91 mA
Answer
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