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Inductors
The inductance of an iron-core coil decreases if
the iron core is removed
the length of the coil decreases
the number of turns is decreased
None of these
the iron core is removed
the length of the coil decreases
the number of turns is decreased
None of these
Answer
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Related Question
Inductors
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
decreases
doubles
remains the same
increases
decreases
doubles
remains the same
increases
Answer
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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
48 s
0.48 μs
0.48 s
0.48 ms
48 s
0.48 μs
0.48 s
Answer
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Inductors
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
less than 0.2 mH
less than 5.5 mH
55 mH
5.5 mH
less than 0.2 mH
less than 5.5 mH
55 mH
5.5 mH
Answer
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Inductors
The winding resistance of a coil can be increased by
increasing the number of turns or using thinner wire
changing the core material
using a thinner wire
increasing the number of turns
increasing the number of turns or using thinner wire
changing the core material
using a thinner wire
increasing the number of turns
Answer
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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
VL > VR
VL < VR
VL = VR
VR ≥ VL
Answer
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