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HOLT HOLT PHYSICS P HYSICS
Chapter
18 Test A Electrical Energy and Capacitance
On the line at the left of each statement, write the letter of the choice that best completes the statement or answers the question. MULTIPLE CHOICE
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
1.
Which Which of the following following is NOT a characteristic characteristic of electrical electrical potential potential energy? energy. a. It is a form of mechanical energy. b. It results from a single charge. c. It results from the interaction between charges. d. It is associated with a charge in an electric field.
2.
When a positive positive charge charge moves because because of a force, what occurs occurs to the electrical potential energy associated with the charge’s position in the system? a. It increases. c. It remains the same. increases, then decreases. b. It decreases. d. It sharply increases,
3.
Two positive positive point charges charges are initially initially separated separated by a distance of 2 cm. If their separation is increased to 6 cm, the resultant electrical potential energy is what factor times the initial electrical potential energy? a. 3 c. 1/3 b. 9 d. 1/9
4.
Charge build up between the plates of a capacitor stops when when a. there is no net charge on the plates. plate. b. unequal amounts of charges accumulate on the plate. c. the potential difference between the plates equals the potential difference between the terminals terminals of the battery. battery. d. the charge on both plates is the same.
5.
When a capacitor discharges, a. it must be attached to a battery. b. charges move from one plate to another through the circuit until both plates are uncharged. c. charges move from one plate to another until equal and opposite charges accumulate on the plates. d. it cannot be connected to a material that conducts.
6.
A capacitor consists consists of two metal plates; plates; __________ is stored stored on one plate and __________ is stored on the other. negative charge; positive positive charge a. negative potential energy; kinetic kinetic energy b. potential c. potential difference; internal resistance residual charge; induced induced charge d. residual Chapter 18
137
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NAME ______ ____________ ____________ ____________ ___________ ___________ _________ ___ DATE _____ ___________ __________ ____ CLAS CLASS S ______ ____________ ____________ ________ __
Chapter
18
HOLT PHYSICS continued
Test A
7.
Increasing the separation of the two charged parallel plates plates of a capacitor that are are disconnected from a battery will produce what effect on the capacitor? a. It will increase the charge. b. It will decrease the charge. c. It will increase the capacitance. d. It will decrease the capacitance.
8.
A uniform electric field with a magnitude of 500 N/C is directed parallel to the the positive x positive x -axis. -axis. If the potent potential ial at x at x = V, what is the potential at x at x = = 5 m is 2500 V, = 2 m? a. 1000 V c. 4000 V b. 2000 V d. 4500 V
9.
A point point charge charge of 3.0 m C is at the origin of a coordinate coordinate system, system, and a second second point charge of –6.0 m C is at x at x = the electric potential at the x the x = = 1.0 m. What is the = 0.50 m point? 9 2 2 (kc = 8.99 × 10 N m /C ) •
a. 1.62 × 105 V
c. –1.08 × 105 V
b. 1.08 × 105V
d. –5.4 × 104 V
10.
A parallel-plate capacitor has a capacitance of C F C F. If the area area of the plat plates es is doubled doubled while the distance between the plates plates is halved, the new capacitance will be /2. a. 2 C . c. C /2. /4. b. 4 C . d. C /4.
11.
What is the capacitance of a parallel-plate capacitor made of two square aluminum plates that are 4.0 cm in length on each side and are separated by 5.0 mm? ( e 0 = 8.85 × 10–12 C2/N•m2) –10 –12 F F a. 2.8 × 10 c. 2.8 × 10 –6 –5 b. 1.0 × 10 F d. 2.0 × 10 F
SHORT ANSWER
Write the answers to the following questions in the space
provided. 12. What is electrical potential energy?
138
Holt Physics Chapter Tests
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Chapter
18
HOLT PHYSICS continued
Test A
interaction? 13. Electrical potential energy is a result of what interaction?
14. What is electric potential?
15. What is potential difference?
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
16. How are electric potential and electrical potential energy related?
Chapter 19
139
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NAME ______ ____________ ____________ ____________ ___________ ___________ _________ ___ DATE _____ ___________ __________ ____ CLAS CLASS S ______ ____________ ____________ ________ __
HOLT PHYSICS continued
Chapter
18
Test A
17. What is capacitance?
18. List two ways to increase the electrical potential energy that can be stored in a capacitor.
Write your answers to the questions on the line to the left and show your work in the space provided. PROBLEMS
19.
20.
140
A proton (q (q = 1.60 × 10–19 C) moves 12 cm on a path parallel to the direction of a uniform electric field of strength 6.0 N/C. What is the change in electrical potential energy?
A 0.10 F capacitor is connected to a 4.0 V battery. How much energy is stored in the capacitor?
Holt Physics Chapter Tests
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
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Print NAME ______________________________________ DATE _______________ CLASS ____________________
HOLT HOLT PHYSICS P HYSICS
Chapter
18 Test B Electrical Energy and Capacitance
On the line at the left of each statement, write the letter of the choice that best completes the statement or answers the question. MULTIPLE CHOICE
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
1.
Which Which of the following following is NOT a characteristic characteristic of electrical electrical potential potential energy? energy. a. It is a form of mechanical energy. b. It results from a single charge. c. It results from the interaction between charges. d. It is associated with a charge in an electric field.
2.
When a positive positive charge charge moves because because of a force, what occurs occurs to the electrical potential energy associated with the charge’s position in the system? a. It increases. c. It remains the same. increases, then decreases. b. It decreases. d. It sharply increases,
3.
Two positive positive point charges charges are initially initially separated separated by a distance of 2 cm. If their separation is increased to 6 cm, the resultant electrical potential energy is what factor times the initial electrical potential energy? a. 3 c. 1/3 b. 9 d. 1/9
4.
When comparin comparingg the net charge of a charged capacitor capacitor with a net charge charge of the same capacitor when it is uncharged, the net charge charge is a. greater in the charged capacitor. b. less in the charged capacitor. c. equal in both cases. charged capacitor, but never equal. d. greater or less in the charged
5.
When a capacitor discharges, a. it must be attached to a battery. b. charges move from one plate to another through the circuit until both plates are uncharged. c. charges move from one plate to another until equal and opposite charges accumulate on the plates. d. it cannot be connected to a material that conducts.
6.
Increasing the potential potential difference across the the two plates of a capacitor will produce what effect on the capacitor? a. It will increase charge. c. It will increase the capacitance. b. It will decrease charge. d. It will decrease the capacitance.
Chapter 18
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NAME ______ ____________ ____________ ____________ ___________ ___________ _________ ___ DATE _____ ___________ __________ ____ CLAS CLASS S ______ ____________ ____________ ________ __
Chapter
18
HOLT PHYSICS continued
Test B
What will be the electric potential at a distance of 0.15 m from a point charge of 6.0 m C? C? (k (kc = 8.99 × 109 N m2/C2) 4 6 a. 5.4 × 10 V c. 2.4 × 10 V 5 7 b. 3.6 × 10 V d. 1.2 × 10 V
7.
•
Two point charges with values of 3.4 m C and 6.6 m C are separated by 0.10 m. What is the electric potential at the point midway between the two point charges? (k ( kc = 8.99 × 9 2 2 10 N m /C ) 6 6 a. 1.8 × 10 V c. 0.9 × 10 V 6 6 b. –0.9 × 10 V d. 3.6 × 10 V
8.
•
9.
A parallel-plate capacitor has a capacitance of C F C F. If the area area of the plat plates es is doubled doubled while the distance between the plates plates is halved, the new capacitance will be /2. a. 2 C . c. C /2. /4. b. 4 C . d. C /4.
10.
A 1.5 m F capacitor is connected to a 9.0 V battery. How much energy is stored in the capacitor? –3 –3 a. 1.7 × 10 J c. 7.5 × 10 J –5 –3 b. 6.1 × 10 J d. 5.4 × 10 J
SHORT ANSWER
Write the answers to the following questions in the space
provided. 11. What is electrical potential energy?
12. Electrical potential energy is a result of what interaction?
142
Holt Physics Chapter Tests
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
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Print NAME ______ ____________ ____________ ____________ ___________ ___________ _________ ___ DATE _____ ___________ __________ ____ CLAS CLASS S ______ ____________ ____________ ________ __
Chapter
18
HOLT PHYSICS continued
Test B
13. What is electric potential?
14. What is potential difference?
15. How are electric potential and electrical potential energy related?
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
16. How does a capacitor store energy?
Chapter 19
143
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NAME ______ ____________ ____________ ____________ ___________ ___________ _________ ___ DATE _____ ___________ __________ ____ CLAS CLASS S ______ ____________ ____________ ________ __
Chapter
18
HOLT PHYSICS continued
Test B
the amount of charge that can be stored on a capacitor. capacitor. 17. Explain why there is a limit to the
18. List two ways to increase the electrical potential energy that can be stored in a capacitor.
Write your answers to the questions on the line to the left and show your work in the space provided. PROBLEM
19.
20.
144
A proton (q (q = 1.60 × 10–19 C) moves 24 cm on a path parallel to the direction of a uniform electric field of strength 5.0 N/C. What is the change in electrical potential energy?
A 3.2 m F capacitor has has a potential potential difference of 21.0 V between its plates. How much additional charge flows into into the capacitor if the potential difference difference is increased to 47.0 V?
Holt Physics Chapter Tests
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
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Chapter Chapt er 18 Test Form A
Chapter Chapt er 18 Test Form B
1. B
1. B
2. B
2. B
3. C
3. C
4. C
4. C
5. B
5. B
6. A
6. A
7. D
7. B
8. C
8. A
9. D
9. B
10. B
10. B
11. C
11. Potential energy associated with a charge due to
12. Potential energy associated with a charge due to
its position in an electric field. 12. the interaction between two charged objects 13. Electric potential is the electrical potential energy associated with a charged particle divided by the charge charge of the particle. particle. 14. Potential difference is the change in electrical potential energy associated with a charged particle divided by the the charge charge of the particle. particle. 15. Electric potential is the electrical potential energy associated with a charged particle in an electric field field divided by the charge charge of the particle. 16. Charges on a capacitor plate repel any additional charges that are brought up to the plate. plate. The work done on charges to place them on the plates is the energy that is stored in the capacitor. 17. The potential can become so great that a spark discharge or an electrical breakdown will occur. 18. 1. Inc Increa rease se the the area of of the plat plates. es. 2. Pla Place ce an ininsulating material between the plates. –19 19. –1.9 × 10 J 5 20. 8.3 × 10 C
its position in an electric field. 13. the interaction between two charged objects 14. Electric potential is the electrical potential energy associated with a charged particle divided by the charge charge of the particle. particle. 15. Potential difference is the change in electrical potential energy associated with a charged particle divided by the the charge of the particle. particle. 16. Electric potential is the electrical potential energy associated with a charged particle in an electric field field divided by the charge charge of the particle. 17. Capac Capacitanc itancee is the measure measure of the ability ability of a device to store charge for a given potential difference. 18. 1. In Incre crease ase the the area of of the plate plates. s. 2. Pla Place ce an ininsulating material between the plates. –19 19. –1.1 × 10 J 20. 0.80 J
218
Holt Physics Chapter Tests
. d e v r e s e r s t h g i r l l A . n o t s n i W d n a t r a h e n i R , t l o H y b © t h g i r y p o C
