1
. [1 point, 10 tries]
Consider the circuit in the figure below, taking
E
= 6 V,
L
= 7.77 mH, and
R
= 4.39 Ω.
What is the inductive time constant of the circuit?
Answer:
1.77E03 s
1
2
. [1 point, 10 tries]
Calculate the current in the circuit 296 µs after the switch is closed.
Answer:
2.10E01 A
1
3
. [1 point, 10 tries]
What is the value of the final steadystate current?
Answer:
1.37E+00 A
1
4
. [1 point, 10 tries]
How long does it take the current to reach 79.5% of its maximum value?
Answer:
2.80E+00 ms
1
5
. [1 point, 10 tries]
An inductor that has an inductance of 14.9H and a resistance of 37.9 Ohms is connected across a
123.7V battery. What is the rate of increase of the current at t=0?
Answer:
8.30e+00 A/s
1
6
. [1 point, 10 tries]
Calculate the energy associated with the magnetic field of a 248 turn solenoid in which a current
of 2.15A produces a flux of 3.62×10
4
Tm
2
in each turn.
Answer:
9.65e02 J
1
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7
. [1 point, 10 tries]
In the figure below, take
E
= 6 V,
R
1
= 4.92 Ω, and
R
2
= 1.23 Ω.
The inductor has negligible resistance. When the switch is thrown open after having been closed
for a long time, the current in the inductor drops to 0.248 A in 0.167 s. What is the inductance of
the inductor?
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 Spring '09
 Britz
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