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Exercise 26.2
A machine part has a resistor protruding from an opening in the side. This resistor is connected to three other resistors, as
shown in the figure . An ohmmeter connected across and reads
2.00 .
Part A
What is the resistance of ?
Express your answer in ohms to two significant figures.
ANSWER:
Exercise 26.12
In the battery has emf 43.0 and negligible internal resistance.
= 6.00 . The current through is 2.50 and the current
through = 5.10 .
X
a b
Ω
X
X = Ω
V
R1 Ω R1 A
R3 A
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Part A
What is the resistance ?
Express your answer with the appropriate units.
ANSWER:
Part B
What is the resistance ?
Express your answer with the appropriate units.
ANSWER:
Exercise 26.24
The batteries shown in the circuit in the figure have negligibly small
internal resistances.
Part A
Find the current through the 30.0 resistor.
ANSWER:
Part B
Find the current through the 20.0 resistor.
ANSWER:
R2
R = 2
R3
R3 =
Ω
I = A
Ω
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Part C
Find the current through the 10.0 battery.
ANSWER:
Exercise 26.30
The 5.00- battery in is removed from the circuit and replaced by a
15.00- battery, with its negative terminal next to point . The rest of
the circuit is as shown in the figure.
Part A
Find the current in the upper branch.
Express your answer with the appropriate units. Enter positive value if the current is to the left and negative value
if the the current is to the right.
ANSWER:
Part B
Find the current in the middle branch.
Express your answer with the appropriate units. Enter positive value if the current is to the left and negative value
if the the current is to the right.
ANSWER:
I = A
V
I = A
V
V b
I =
I =
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Part C
Find the current in the lower branch.
Express your answer with the appropriate units. Enter positive value if the current is to the left and negative value
if the the current is to the right.
ANSWER:
Part D
Find the potential difference of point relative to point .
Express your answer with the appropriate units.
ANSWER:
Exercise 26.32
In the circuit shown in the figure both batteries have insignificant
internal resistance and the idealized ammeter reads 2.00 in the
direction shown.
Part A
Find the emf of the battery.
ANSWER:
Part B
I =
Vab a b
Vab =
A
E
E = V
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Is the polarity shown correct?
ANSWER:
RC Circuit and Current Conceptual Question
In the diagram below,the two resistors, and , are identical and
the capacitor is initially uncharged with the switch open.
Part A
How does the current through compare with the current through immediately after the switch is first closed?
You did not open hints for this part.
ANSWER:
Part B
How does the current through compare with the current through a very long time after the switch has been closed?
You did not open hints for this part.
ANSWER:
yes
no
R1 R2
R1 R2
The current through R1 the current through .
is greater than
is less than
is equal to
R2
R1 R2
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Part C
How does the current through compare with the current through immediately after the switch is opened (after being
closed a very long time)?
You did not open hints for this part.
ANSWER:
Exercise 26.50
A 16.0- capacitor is charged to a potential of 50.0 and then discharged through a 265- resistor.
Part A
How long does it take the capacitor to lose half of its charge?
Express your answer with the appropriate units.
ANSWER:
Part B
How long does it take the capacitor to lose half of its stored energy?
Express your answer with the appropriate units.
ANSWER:
Exercise 26.48
The current through R1 the current through .
is greater than
is less than
is equal to
R2
R1 R2
The current through R the current through . 1
is greater than
is less than
is equal to
R2
μF V Ω
t =
t =
11/30/2018 HW5
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A 1.70- capacitor is charging through a 14.0- resistor using a 12.0- battery.
Part A
What will be the current when the capacitor has acquired 1/4 of its maximum charge?
ANSWER:
Part B
Will it be 1/4 of the maximum current?
ANSWER:
Exercise 26.46
A resistor and capacitor are connected in series to an emf source. The time constant for the circuit is 0.780 .
Part A
A second capacitor, identical to the first, is added in series. What is the time constant for this new circuit?
Express your answer with the appropriate units.
ANSWER:
Part B
In the original circuit a second capacitor, identical to the first, is connected in parallel with the first capacitor. What is the time
constant for this new circuit?
Express your answer with the appropriate units.
ANSWER:
Problem 26.38
μF Ω V
I = A
yes
no
s
τ =
τ =
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Part A
A 4.0-μF capacitor that is initially uncharged is connected in series with a 4.0-k resistor and an ideal 17.0-V battery. How
much energy is stored in the capacitor 17 ms after the battery has been connected?
ANSWER:
Problem 26.57
Part A
Find the potential of point with respect to point in the figure .
Express your answer using two significant figures.
ANSWER:
Part B
If points and are connected by a wire with negligible resistance, find the magnitude of the current in the 10.0 battery.
Express your answer using two significant figures.
ANSWER:
Ω
890 nJ
15,000 kJ
25 µJ
250,000 nJ
a b
Vab = V
a b V
I = A
11/30/2018 HW5
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Problem 26.69
A resistor consumes electrical power when connected to an emf . When resistor is connected to the same emf, it
consumes electrical power .
Part A
In terms of and , what is the total electrical power consumed when they are both connected to this emf source in
parallel?
ANSWER:
Part B
In terms of and , what is the total electrical power consumed when they are both connected to this emf source in
series?
ANSWER:
Score Summary:
Your score on this assignment is 0.0%.
You received 0 out of a possible total of 12 points.
R1 P1 E R2
P2
P1 P2
P = tot
P1 P2
P = tot
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