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Inductors

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

160 mV
16 mV
2.5 mV
1.6 mV

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Inductors
A 240 H inductor is equivalent to a

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

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Inductors
The winding resistance of a coil can be increased by

increasing the number of turns
using a thinner wire
changing the core material
increasing the number of turns or using thinner wire

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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?

78 mA
57 mA
400 mA
91 mA

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Inductors
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

1.25 mV
18 mV
180 mV
1.8 mV

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Inductors
The inductance of an iron-core coil decreases if

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

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