Phy Outline Ch17 Stp

8/2/2019 Phy Outline Ch17 Stp

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Preview

Multiple Choice

Short Response

Extended Response

Chapter 17 Standardized Test Prep


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Multiple Choice

1. What changes would take place if theelectron moved from point A to point B inthe uniform electric field?

A.The electrons electrical potentialenergy would increase; its electricpotential would increase.

B.The electrons electrical potentialenergy would increase; its electricpotential would decrease.

C.The electrons electrical potentialenergy would decrease; its electric

potential would decrease.D.Neither the electrons electricalpotential energy nor its electric potentialwould change.

Standardized Test PrepChapter 17


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Multiple Choice, continued

1. What changes would take place if theelectron moved from point A to point B inthe uniform electric field?

A.The electrons electrical potentialenergy would increase; its electricpotential would increase.

B.The electrons electrical potentialenergy would increase; its electricpotential would decrease.

C.The electrons electrical potentialenergy would decrease; its electric

potential would decrease.D.Neither the electrons electricalpotential energy nor its electric potentialwould change.



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2. What changes would take place if theelectron moved from point A to point C inthe uniform electric field?

F.The electrons electrical potentialenergy would increase; its electricpotential would increase.

G.The electrons electrical potentialenergy would increase; its electricpotential would decrease.

H.The electrons electrical potentialenergy would decrease; its electric

potential would decrease.J.Neither the electrons electricalpotential energy nor its electric potentialwould change.



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2. What changes would take place if theelectron moved from point A to point C inthe uniform electric field?

F.The electrons electrical potentialenergy would increase; its electricpotential would increase.G.The electrons electrical potentialenergy would increase; its electricpotential would decrease.

H.The electrons electrical potentialenergy would decrease; its electric

potential would decrease.J.Neither the electrons electricalpotential energy nor its electric potentialwould change.



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Use the following passage to answer questions 34.

A proton (q = 1.6 1019 C) moves 2.0 106 m inthe direction of an electric field that has a magnitudeof 2.0 N/C.

3. What is the change in the electrical potential energyassociated with the proton?

A.6.4 1025 J

B.4.0 106 V

C. +6.4 1025 J

D. +4.0 106 V


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3. What is the change in the electrical potential energyassociated with the proton?

A.6.4 1025 J

B.4.0 106 V

C. +6.4 1025 J

D. +4.0 106 V


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4.What is the potential difference between the protonsstarting point and ending point?

F.6.4 1025 J

G.4.0 106 V

H. +6.4 1025 J

J. +4.0 106 V


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4.What is the potential difference between the protonsstarting point and ending point?

F.6.4 1025 J

G.4.0 106 V

H. +6.4 1025 J

J. +4.0 106 V


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5. If the negative terminal of a 12 V battery is grounded,what is the potential of the positive terminal?

A.12 V

B. +0 VC. +6 V

D. +12 V


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5. If the negative terminal of a 12 V battery is grounded,what is the potential of the positive terminal?

A.12 V

B. +0 VC. +6 V

D. +12 V


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6. If the area of the plates of a parallel-plate capacitor isdoubled while the spacing between the plates ishalved, how is the capacitance affected?

F.Cis doubledG.Cis increased by four times

H.Cis decreased by 1/4

J.Cdoes not change


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6. If the area of the plates of a parallel-plate capacitor isdoubled while the spacing between the plates ishalved, how is the capacitance affected?

F.Cis doubledG.Cis increased by four times

H.Cis decreased by 1/4

J.Cdoes not change


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A potential difference of 10.0 V exists across theplates of a capacitor when the charge on each plate

is 40.0 C.7. What is the capacitance of the capacitor?

A. 2.00 104 F

B. 4.00 104 F

C. 2.00 106 F

D. 4.00 106 F


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is 40.0 C.7. What is the capacitance of the capacitor?

A. 2.00 104 F

B. 4.00 104 F

C. 2.00 106 F

D. 4.00 106 F


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is 40.0 C.8. How much electrical potential energy is stored in the

capacitor?

F. 2.00 104 J

G. 4.00 104 JH. 2.00 106 J

J. 4.00 106 J


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is 40.0 C.8. How much electrical potential energy is stored in the

capacitor?

F. 2.00 104 J

G. 4.00 104 JH. 2.00 106 J

J. 4.00 106 J


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9. How long does it take 5.0 C of charge to passthrough a given cross section of a copper wire if I =5.0 A?

A. 0.20 sB. 1.0 s

C. 5.0 s

D. 25 s


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9. How long does it take 5.0 C of charge to passthrough a given cross section of a copper wire if I =5.0 A?

A. 0.20 sB. 1.0 s

C. 5.0 s

D. 25 s


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10. A potential difference of 12 V produces a current of0.40 A in a piece of copper wire. What is theresistance of the wire?

F.4.8 G.12

H.30

J.36


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10. A potential difference of 12 V produces a current of0.40 A in a piece of copper wire. What is theresistance of the wire?

F.4.8 G.12

H.30

J.36


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11. How many joules of energy are dissipated by a 50.0W light bulb in 2.00 s?

A. 25.0 J

B. 50.0 JC. 100 J

D. 200 J


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11. How many joules of energy are dissipated by a 50.0W light bulb in 2.00 s?

A. 25.0 J

B. 50.0 JC. 100 J

D. 200 J


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12. How much power is needed to operate a radio thatdraws 7.0 A of current when a potential difference of115 V is applied across it?

F. 6.1 102

WG. 2.3 100 W

H. 1.6 101 W

J. 8.0 102 W


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12. How much power is needed to operate a radio thatdraws 7.0 A of current when a potential difference of115 V is applied across it?

F. 6.1 102

WG. 2.3 100 W

H. 1.6 101 W

J. 8.0 102 W


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Short Response

13. Electrons are moving from left to right in a wire. Noother charged particles are moving in the wire. Inwhat direction is the conventional current?


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Short Response, continued

14. What is drift velocity, and how does it compare withthe speed at which an electric field travels through awire?


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14. What is drift velocity, and how does it compare withthe speed at which an electric field travels through awire?

Answer: Drift velocity is the net velocity of a chargecarrier moving in an electric field. Drift velocities in awire are typically much smaller than the speeds atwhich changes in the electric field propagate throughthe wire.


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15. List four factors that can affect the resistance of awire.


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15. List four factors that can affect the resistance of awire.

Answer: length, cross-sectional area (thickness),temperature, and material


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Extended Response

16. A parallel-plate capacitor is made of two circularplates, each of which has a diameter of 2.50 103 m.The plates of the capacitor are separated by a spaceof 1.40 104 m.

a. Assuming that the capacitor is operating in a vacuumand that the permittivity of a vacuum (e0 = 8.85 10

12C2/Nm2) can be used, determine the capacitance ofthe capacitor.

S d di d T P


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Extended Response, continued

16. A parallel-plate capacitor is made of two circularplates, each of which has a diameter of 2.50 103 m.The plates of the capacitor are separated by a spaceof 1.40 104 m.

a. Assuming that the capacitor is operating in a vacuumand that the permittivity of a vacuum (e0 = 8.85 10

12C2/Nm2) can be used, determine the capacitance ofthe capacitor.

Answer: 3.10 1013 F

S d di d T P


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16. A parallel-plate capacitor is made of two circularplates, each of which has a diameter of 2.50 103m. The plates of the capacitor are separated by aspace of 1.40 104 m.

b. How much charge will be stored on each plate of thecapacitor when the capacitors plates are connected

across a potential difference of 0.12 V?

St d di d T t P


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b. How much charge will be stored on each plate of thecapacitor when the capacitors plates are connected

across a potential difference of 0.12 V?

Answer: 3.7 1014 C

St d di d T t P


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c. What is the electrical potential energy stored in thecapacitor when fully charged by the potentialdifference of 0.12 V?

St d di d T t P


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c. What is the electrical potential energy stored in thecapacitor when fully charged by the potentialdifference of 0.12 V?

Answer: 2.2 1015 J

Standardi ed Test Prep17


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d. What is the potential difference between a pointmidway between the plates and a point that is 1.10 104 m from one of the plates?

Standardized Test Prep17


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d. What is the potential difference between a pointmidway between the plates and a point that is 1.10 104 m from one of the plates?

Answer: 3.4 102 V

Standardized Test Prep17


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e. If the potential difference of 0.12 V is removed fromthe circuit and the circuit is allowed to discharge untilthe charge on the plates has decreased to 70.7percent of its fully charged value, what will the

potential difference across the capacitor be?

Standardized Test PrepC 17


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e. If the potential difference of 0.12 V is removed fromthe circuit and the circuit is allowed to discharge untilthe charge on the plates has decreased to 70.7percent of its fully charged value, what will the

potential difference across the capacitor be?

Answer: 8.5 102 V

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Phy Outline Ch17 Stp