Problem 7.36 PSpice|Multisim
The switch in the circuit shown in has been in position a
for a long time before moving to position b at t = 0.
Part A
Choose the correct numerical expression for i L (t) for t
≥ 0
.
ANSWER:
i L (t) = −0.8 + 2.4e
i L (t) = 2.4 − 0.8e
i L (t) = 2.8 + 0.4e
−25t
−25t
−4t
i L (t) = −0.8 + 2.4e
A, where t is in milliseconds
A, where t is in milliseconds
A, where t is in milliseconds
−4t
A, where t is in milliseconds
Part B
Choose the correct numerical expression for v o (t) for t
≥ 0
.
ANSWER:
v o (t) = 19.2 + 41.6e
v o (t) = 41.6 − 19.2e
v o (t) = 19.2 − 41.6e
v o (t) = 41.6 + 19.2e
25t
V, where t is in milliseconds
−25t
V, where t is in milliseconds
−4t
V, where t is in milliseconds
−4t
V, where t is in milliseconds
Part C
Find the numerical value of v L (0+ ).
Express your answer to three significant figures and include the appropriate units.
ANSWER:
v L (0
+
)
= Part D
Find the numerical value of v o (0+ ).
Express your answer to three significant figures and include the appropriate units.
ANSWER:
v o (0
+
)
= Problem 7.42
The switch in the circuit in has been closed for a long time.
A student abruptly opens the switch and reports to her
instructor that when the switch opened, an electric arc with
noticeable persistence was established across the switch,
and at the same time the voltmeter placed across the coil
was damaged.
Part A
On the basis of your analysis of the circuit in , can
you explain to the student why this happened?
Drag the terms on the left to the appropriate blanks
on the right to complete the sentences.
ANSWER:
Reset
small
large
also appears
doesn't appear
Help
Opening the inductive circuit causes a very voltage to be induced across the
inductor L. This voltage across the
switch, causing the switch to arc over. At the same
time, the voltage across L
damages the meter movement.
Problem 7.44 PSpice|Multisim
The switch in the circuit in has been open a long time
before closing at t = 0.
Part A
Find i o (t) for t
≥ 0
.
Express your answer in terms of t, where t is in milliseconds.
ANSWER:
i o (t)
= A Problem 7.51
Assume that the switch in the circuit in has been in
position a for a long time and that at t = 0 it is moved to
position b.
Part A
Find v C (0
+
)
.
Express your answer to three significant figures and include the appropriate units.
ANSWER:
v C (0
+
)
= Part B
Find v C (∞).
Express your answer to three significant figures and include the appropriate units.
ANSWER:
v C (∞)
= Part C
Find τ for t
> 0
.
Express your answer to three significant figures and include the appropriate units.
ANSWER:
τ
= Part D
Find i(0+ ).
Express your answer to three significant figures and include the appropriate units.
ANSWER:
i(0
+
)
= Part E
Choose the correct expression for v C (t), t
≥ 0
.
ANSWER:
v C (t) = 150 + 270e
v C (t) = 15 + 27e
−t
v C (t) = 15 − 27e
V, where t is in seconds
V, where t is in second
v C (t) = 150 − 270e
−t
1000t
−1000t
V, where t is in seconds
V, where t is in seconds
Part F
Find i(t), t
≥ 0
+
.
Express your answer in terms of t, where t is in milliseconds.
ANSWER:
i(t)
= mA Problem 7.61 PSpice|Multisim
The switch in the circuit shown in has been in the OFF
position for a long time. At t = 0 , the switch moves
instantaneously to the ON position.
Part A
Find v o (t) for t
≥ 0
.
Express your answer in terms of t, where t is in milliseconds.
ANSWER:
v o (t)
= V Problem 7.69 PSpice|Multisim
There is no energy stored in the circuit in at the time the
switch is closed. Part A
Find i(t) for t
≥ 0
.
Express your answer in terms of t, where t is in microseconds.
ANSWER:
i(t)
= mA Part B
Find v 1 (t) for t
≥ 0
+
.
Express your answer in terms of t, where t is in microseconds.
ANSWER:
v 1 (t)
= V Part C
Find v 2 (t) for t
≥ 0
+
.
Express your answer in terms of t, where t is in microseconds.
ANSWER:
v 2 (t)
= V Part D
Find v 3 (t) for t
≥ 0
+
.
Express your answer in terms of t, where t is in microseconds.
ANSWER:
v 3 (t)
= V Part E
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