Physics Unit17: Electric Potential - 题库网 (tiku.one)

1#

Which of the following is not a vepr gbwq7p+)8 vrqn7l 3ctor?

A. electric force

B. electric field

C. electric potential

D. electric line of force

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One joule per coulom*zk7d 4 p ,to iyd/rjf/p6y/xrb is a

A. newton.

B. volt.

C. electron-volt.

D. farad.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical aluminum objects are insulated from their surroundings. Object Agxm( .t .v 6*kw8 +/v(fz cy0fnweqvmbcht(/e has a net charge of excess electrons. Object B is grounded. Which object is at a higher po 0t/yxen wcg .vew( v*/vm8.( fbq(6fhz c+kmttential?

A. Object A

B. Object B

C. Both are at the same potential.

D. cannot be determined without more information

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For a proton moving in the direction of the electric fieldj3 eaurh)2x: n d3hc/j

A. its potential energy increases and its electric potential decreases.

B. its potential energy decreases and its electric potential increases.

C. its potential energy increases and its electric potential increases.

D. its potential energy decreases and its electric potential decreases.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For an electron moving in a direction opposite to the electric fieldy ztq *xw92s5 hm qw-/ 47n4t1cd2aoxzz*yhx u

A. its potential energy increases and its electric potential decreases.

B. its potential energy decreases and its electric potential increases.

C. its potential energy increases and its electric potential increases.

D. its potential energy decreases and its electric potential decreases.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Several electrons are pl)m korhz+fah3*: xu zr(;we6;lmq vq2aced on a hollow conducting sphere. They

A. clump together on the sphere's outer surface.

B. clump together on the sphere's inner surface.

C. become uniformly distributed on the sphere's outer surface.

D. become uniformly distributed on the sphere's inner surface.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small charged ball is accelerated from rest to a speed v by a 500 V potenti.q +kv+har1sr al difference. If the potential difference is changed to 2000 V,vqh rrs1k.++a what will the new speed of the ball be?

A.

v

B.

2 v

C.

4 v

D.

16 v

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A surface on which all points are at the same x0z2zxvci0 ;1m*n tcrpotential is referred to as

A. a constant electric force surface.

B. a constant electric field surface.

C. an equipotential surface.

D. an equivoltage surface.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative charge is moved from point A to poi :mck,.f efg1ss *xeo4evm z*8nt B along an equipotential surfaces4f*,kef8v cz:em*m 1og. esx.

A. The negative charge performs work in moving from point A to point B.

B. Work is required to move the negative charge from point A to point B.

C. Work is both required and performed in moving the negative charge from point A to point B.

D. No work is required to move the negative charge from point A to point B.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An equipotential surface m 6ze3rsgv5w 4tunb: 3(nc vxz/ust be

A. parallel to the electric field at any point.

B. perpendicular to the electric field at any point.

C. does not exist if the electric field is not uniform.

D. can not exist if the electric field is too strong.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The energy acquired by a particle carryqx dnso oc:9;in6s7s* ing a charge equal to that on the electron as a result of moving through a potential dinxdcn;s7osq:* os9 i6fference of one volt is referred to as

A. a joule.

B. an electron-volt.

C. a proton-volt.

D. a coulomb.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The electron-volt is a i je54u/ jcl5*y/tvkzunit of

A. voltage.

B. current.

C. power.

D. energy.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One electron-volt corresponds meyu6ga4 ;+y2of 4cmdto

A.

8.0 \times 10^{- 20} J

.

B.

1.6 \times 10^{- 19} J

.

C.

9.5 \times 10^{- 17} J

.

D.

1.9 \times 10^{- 16} J

.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The absolute potential at ym3lu:fxct 7w:bn eir./1q-wa distance of 2.0 m from a positive point charge is 100 V. What is the absolute potential 4.0.befl:- ww:x/cm3y1r7itqn u m away from the same point charge?

A.

25 V

B.

50 V

C.

200 V

D.

400 V

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The absolute potential at a distance of 2.0 m from a negative point charge is yz5ev 4gi7t6h-100 V. What is the absolute potential 4.0 m 5i4 vhze7t gy6away from the same point charge?

A. -25 V

B. -50 V

C. -200 V

D. -400 V

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The absolute potential at the exact center olc;ludbk .:dl w dy*f l4e05z1ks-x 6tf a square is 3.0 V when a charge of +Q 6bl. ldf; :50c s 4uezdlkxk*1l-t ywdis located at one of the square's corners. What is the absolute potential at the square's center when each of the other corners is also filled with a charge of +Q?

A. zero

B.

3.0 V

C.

9.0 V

D.

12 V

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The absolute potential at the center of a square is 3.0 V when a charge of uqi dk3*8n i+u+Q is located at one of the square's corners. What is the absol*83+ii qudn kuute potential at the square's center when a second
charge of -Q is placed at one of the remaining corners?

A. zero

B.

3.0 V

C.

6.0 V

D.

9.0 V

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Electric dipoles alwaykc+s bj8e1 /3e+ ewkwqs consist of two charges that are

A. equal in magnitude; opposite in sign.

B. equal in magnitude; both are negative.

C. equal in magnitude; both are positive.

D. unequal in magnitude; opposite in sign.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One coulomb per volt is a* t; ehvfeyd:/

A. joule.

B. electron-volt.

C. farad.

D. watt.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two parallel-plate capacitors are identical in every respect except that one has04n3r gsop 9qh twice the plate area ofr4 3pgqsho90n the other. If the smaller capacitor has capacitance C, the larger one has capacitance

A. C/2

B. C

C. 2C

D. 4C

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor has a capacitance of C. If the area of the plates yg-z4 p)a*+8y nfjtg )o m;0kae7lhzdis doubled and the distance betwee 4fh)gaz 8kdjga-m7 ypy;*tz0)l n+oen the plates is halved, what is the new capacitance?

A.

C / 4

B.

C / 2

C.

2 C

D.

4 C

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A battery charges a parallel-plate capacitor fully and then is removed. The t.w, b62yvepq plates are immediately pulled apart. (With the battery disconnected, the amount of charge on the plates remains constant.) What happens to the potential difference between the plates as they are be2pywv.,qte b6 ing separated?

A. It increases.

B. It decreases.

C. It remains constant.

D. cannot be determined from the information given

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the electric field between the plates of a given capacitor is weakened, ther+ xkt fw2sl/ jfy/605xwo4q r6a8ed6w coh*n capacitance of that capaoke84//6 wrf5xtcf a0 ox ljywnsqdr2+*h6w 6citor

A. increases.

B. decreases.

C. does not change.

D. cannot be determined from the information given

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The plates of a parallel-plate capacitor are maintained with constant voltage by*vn xac66t qq1g;or 3f a battery as they are pulled apart. During this process, theqfx; q3n vctr* 61a6og amount of charge on the plates must

A. increase.

B. decrease.

C. remain constant.

D. either increase or decrease. There is no way to tell from the information given.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The plates of a parallel-plate capacitor are maintained wirlvtwjyk-igl0142u9 n- + rdgth constant voltage by a batteu rk- g20vy1-ltig4r lnd9w j+ry as they are pulled apart. What happens to the strength of the electric field during this process?

A. It increases.

B. It decreases.

C. It remains constant.

D. cannot be determined from the information given

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26#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State three reasons for adding a dielectric materzm;; z* xv;nexial between the plates of a capacitoz;v ;*exxzmn;r.

该题自我估分: (必填) (满分:1.0分)

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A dielectric material su.ci6 *b*)ev izicxw.ich as paper is placed between the plates of a capacitor. What happens tib*c izv.) e6ixwc .*io the capacitance?

A. no change

B. becomes larger

C. becomes smaller

D. becomes infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A dielectric material such as paper is plac . 3fnbe q ez1t iaaww.9/2ipfg5c/r-led between the plates of a capacitor holding a fixed charge. What happens to the electric field between the pba zf2 f35.tileq1i9 p / e/-wgwcrna.lates?

A. no change

B. becomes stronger

C. becomes weaker

D. reduces to zero

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor is connected to a ly1u;(edohzah 9-j5d4ej ,uk battery and becomes fully charged. The capacitor is then disconnected, and the separation between the plat9ylkh dhed5,;z jjo1a4-( ueues is increased in such a way that no charge leaks off. The energy stored in this capacitor has

A. increased.

B. decreased.

C. not changed.

D. become zero.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Doubling the capacitance of a capacitor holding a constant charge c/a(mf9lt ra3fqkhdk*h-:o h4gmyq 8 3auses the energy stored in that capacitor*93 y4-38(:hk ta hqhmdqfg flm/aro k to

A. quadruple.

B. double.

C. decrease to one half.

D. decrease to one fourth.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Doubling the voltage across a given carn h;;cjy41gxpacitor causes the energy stored in that can4yxg rcjh;;1 pacitor to

A. quadruple.

B. double.

C. reduce to one half.

D. reduce to one fourth.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

It takes 50 J of energy to movek, 9x/ yac:d i -aocpno)yn/-d 10 C of charge from point A to point B. What is the potential difference between points A an dpki/co- d:yx/)nn- oc a,a9yd B?

A.

500 V

B.

50 V

C.

5.0 V

D.

0.50 V

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The net work done in moving an electron from poi52 3*+7 s8jxq+rlqc+gt 6nlzibw x heqnt A, where the potential is -50 V, to i+5j3bqlrs qwn6zc8 7x* +t+lq e2g xhpoint B, where the potential is +50 V, is

A.

+ 1.6 \times 10^{- 17} J

.

B.

- 1.6 \times 10^{- 17} J

.

C. zero.

D. none of the given answers

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, initially +xfn -t:yer 3k cdc em *vzf)1)xfj,j2at rest, is accelerated through an electric potential difference of 500 V. What is the kinetic energy of the proton*xkvf)ze1 r:-jf2cd n,m)e tcyj +3xf?

A.

500 J

B.

8.0 \times 10^{- 17} J

C.

1.6 \times 10^{- 19} J

D. zero

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, initially at rest, is accelerated thr 8ny6yn mqlis1f ;wvd iuqu 6p):e7j:7ough an electric potential difference of 500 V. What is the speed of the i d8npsueq7qv:yml7:;ynw6 j i1uf)6 proton?

A.

2.2 \times 10^{5} m / s

B.

3.1 \times 10^{5} m / s

C.

9.6 \times 10^{10} m / s

D. zero

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Starting from rest, a proton falls through a 68zr+zzh g,k jz/xud-potential difference of 1200 V. What speed does it acqd/ uzkr +-jxz6g8hz,zuire?

A.

1.2 \times 10^{5} m / s

B.

2.4 \times 10^{5} m / s

C.

3.6 \times 10^{5} m / s

D.

4.8 \times 10^{5} m / s

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much work does 9.0 V do iysg7 3 d-+gj8+z zn ogk7oui3y6ryko+n moving

8.5 \times 10^{18} e l e c t r o n s

?

A.

12 J

B.

7.7 J

C.

1.4 J

D.

1.1 J

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A stationary electron is accelerated thveqw-u 5, 2s. egs md o(dkjhskg4.f28rough a potential difference of 500 V. What is the velocity of the electre2sdw(mk-.h4d, .fev 5ugsk8q j s go2on afterward?

A.

1.3 \times 10^{6} m / s

B.

2.6 \times 10^{6} m / s

C.

1.3 \times 10^{7} m / s

D.

2.6 \times 10^{7} m / s

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-g object carries a charge) uxc(vv5zaogz:z,3n of 20 mC. The object is accelerated from rest through a pot oznauzv(5,c)zg xv: 3ential difference, and afterward the ball is moving at 2.0 m/s. What is the magnitude of the potential difference?

A.

800 k V

B.

400 k V

C.

800 V

D.

400 V

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 6.0-V battery maintain r,z+otwuqovbggc k*j9 ; -3r:s the electrical potential difference between two parallel metal plates separated by 1.0 mm. What i*r-v ruo; jo kb,9+3gwtg z:qcs the electric field between the plates?

A. 6.0 V/m

B. 600 V/m

C. 6000 V/m

D. zero

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A uniform electric field, with a magnitude of 500 V/m, is directko 5d7h9gc- oo go5i6hed parallel to the +x axis. If the potential at x = 5.0 m is 2500 V, what is the potential at x = cog go7 5iohh-k5o9d62.0 m?

A. 500 V

B. 1000 V

C. 2000 V

D. 4000 V

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider a uniform electric field of 50 N/C dimqic;, :te8t irected toward the east. If the voltage measured relative to ground at a given point is 80 V, what is the voltage at a point 1.0 m directly west omcit:i;8tq, e f that point?

A.

30 V

B.

50 V

C.

80 V

D.

130 V

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton moves 0.10 m along thed g 7yj1l1j3tnd l(f5t direction of an electric field of magnitude 3.0 V/m. Whald1gtl7 f3jjt ( dy15nt is the change in kinetic energy of the proton?

A.

4.8 \times 10^{- 20} J

B.

3.2 \times 10^{- 20} J

C.

1.6 \times 10^{- 20} J

D.

8.0 \times 10^{- 21} J

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two parallel plates, separated by 0.20 m, are comd3by ka5+;4pm nq0thnnected to a 12-V battery. An electron released from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance 1.50 m from the positive plate, what is the potential difference betwhq0;3 btmnk my4dpa+5 een the initial and final points?

A.

2.4 V

B.

3.0 V

C.

4.8 V

D.

6.0 V

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two parallel plates, s; 9r, - ldhn wtqk.92afc(xncqeparated by 0.20 m, are connected to a 12-V battery. An electron released from rest at a location 0.10 m from the negative plate. 9qk.c 2nnhfla,wdr-x ;tq9 c (When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy does the electron gain?

A.

2.4 \times 10^{- 19} J

B.

4.8 \times 10^{- 19} J

C.

7.2 \times 10^{- 19} J

D.

9.6 \times 10^{- 19} J

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two parallel plates, separated by 0.20 m, akt0lgg2 )1s pere connected to a 12-V battery. An electron released from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance0ptg1kgle s2 ) 0.050 m from the positive plate, what is the speed of the electron?

A.

5.0 \times 10^{5} m / s

B.

1.0 \times 10^{6} m / s

C.

5.0 \times 10^{6} m / s

D.

1.0 \times 10^{7} m / s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider a uniform electric field of 50 N/C directed toward the east. Icfg/ cx4lh: ey96fb l-f the voltage measured relative to ground at a given point in the field is 80 V, what is the voltage at a poi /c xflbl6yc49:hf -egnt 1.0 m directly east of the point?

A.

15 V

B.

30 V

C.

90 V

D.

130 V

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider a uniform electric field of 50 N/C directed toward the east. If the 5wy8w w*yzvb. vozw5vw . 8bwy*yltage measured relative to ground at a given point in the field is 80 V, what is the voltage at a point 1.0 m directly south of that point?

A. zero

B.

30 V

C.

50 V

D.

80 V

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a Cu2+ ion drops through a potential difference of 12 V, 7z4 ) 4cynxt4 cjln-o/5m1g dvnnxh,mit will acquire a kinetic energy (in the aclz x/d,g) x 54ym1n-cn4n7h nomj4vtbsence of friction) of

A. 3.0 eV

B. 6.0 eV

C. 12 eV

D. 24 eV

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the potential at a distance of yernbq 9x-7lqh0+gt,

5.0 \times 10^{- 10} m

from a nucleus of charge +50e?

A.

120 V

B.

140 V

C.

170 V

D.

210 V

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two 3.00-mC charges are at th dwtt2, .tn6jte ends of a meter stick. Find the electrical potential for the center of the meter tt dj6nt2. wt,stick.

A. zero

B.

2.70 \times 10^{4} V

C.

5.40 \times 10^{4} V

D.

1.08 \times 10^{5} V

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 5.0-nC charge is at (0 oxg4pskf79u y i.g4+2ce mr,i, 0) and a -2.0-nC charge is at (3.0 m, 0). If the poten i, ckyr g+x4mp.i74sef2 o9ugtial is taken to be zero at infinity, what is the electric potential at point (0, 4.0 m)?

A.

15 V

B.

3.6 V

C.

11 V

D.

7.7 V

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 5.0-nC charge is at (0, 0) and a -2.0-nC charge is anrnp4x) vec, h,q k 6,q0wnsp:t (3.0 m, 0). If the potential is taken to be zero at infinity, what is the electric poqn ),csh ,rp6nk0:4wp,ve xnqtential energy of a 1.0-nC charge at point (0, 4.0 m)?

A.

1.5 \times 10^{- 8} J

B.

3.6 \times 10^{- 9} J

C.

1.1 \times 10^{- 8} J

D.

7.7 \times 10^{- 9} J

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 5.0-nC charge is a-tgdy ;,kap;ak(2h p+r suc ,ft (0, 0) and a -2.0-nC charge is at (3.0 m, 0). If the potential is tac-ks;h(2t,k;d +,gayf ap pruken to be zero at infinity, what is the work required to bring a 1.0-nC charge from infinity to point (0, 4.0 m)?

A.

1.5 \times 10^{- 8} J

B.

3.6 \times 10^{- 9} J

C.

1.1 \times 10^{- 8} J

D.

7.7 \times 10^{- 9} J

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Four charges of equal charge +q are placed at the corners of a rectangle of sid ig* su5; h:c1o hzt*ciffo-2hes a and b. What is the potential at the center of-h1cf;g oh 2if*5o: cis hutz* the rectangle if q = 2.0 mC, a = 3.0 cm, and b = 4.0 cm?

A.

1.3 \times 10^{6} V

B.

2.9 \times 10^{6} V

C.

3.5 \times 10^{6} V

D.

7.8 \times 10^{6} V

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A square is 1.0 m on a side. Charges of +4.0 mC are placed in two diagonally o0gie2 ,khhyb,pposite corners. In the other two corners are placed ch y,ei2b0 hg,kharges of +3.0 mC and -3.0 mC. What is the absolute potential in the square's center?

A.

1.0 \times 10^{4} V

B.

1.0 \times 10^{5} V

C.

1.0 \times 10^{6} V

D. infinite

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An alpha particle (cha6edpf uo+5m4q o,6 bxn:d.mku yj,w( arge +2e, mass

6.64 \times 10^{- 27} k g

) moves head-on at a fixed gold nucleus (charge +79e). If the distance of closest approach is

2.0 \times 10^{- 10} m

, what was the initial speed of the alpha particle?

A.

2.3 \times 10^{5} m / s

B.

4.6 \times 10^{5} m / s

C.

2.3 \times 10^{6} m / s

D.

4.6 \times 10^{6} m / s

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How much energy is necessary to place three charges, each of 2.0 mC, a 88.wndr:85 -s4ushtybaw cew3so pfvu)s3p(t the corners of an equilateral triangle of side 2.0 cm: 8ryws8s- 4wdhs s3v8buot5(wpe3p .cunaf)?

A.

4.5 J

B.

5.4 J

C.

6.7 J

D.

7.6 J

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What charge appears on the plates of a 2.0-mF capacitor when it is charged to 1c 2 rg-b6k1d8 5g+ iwo9nryoyz00 V?-w 5zobr1692 gdgrk+o 8ncyy i

A.

50 m C

B.

100 m C

C.

150 m C

D.

200 m C

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor:( gc9ucn btt8 has plates of area

0.50 m^{2}

separated by a distance of 2.0 mm. What is this capacitor's capacitance?

A.

250 F

B.

50 F

C.

2.2 \times 10^{- 9} F

D.

4.4 \times 10^{- 10} F

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor is filled with air, and the plates are separateh8qna) v 56p(vzzd qh:d by 0.050 mm. If the caznhv6 a pz85h)q:q(vd pacitance is 17.3 pF, what is the plate area?

A.

4.9 \times 19^{- 5} m^{2}

B.

9.8 \times 10^{- 5} m^{2}

C.

2.4 \times 10^{- 4} m^{2}

D.

4.8 \times 10^{- 4} m^{2}

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor hsn 1o,8co: i x:dt.qhgas plates of area

0.20 m^{2}

separated by a distance of 1.0 mm. What is the strength of the electric field between these plates when this capacitor is connected to a 6.0-V battery?

A. 1200 N/C

B. 3000 N/C

C. 6000 N/C

D. 1500 N/C

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor has a plate separation of 5.0 cm. If the parpo7l vpm1)9 otential difference between the plates is 2000 V, with the top plate at the higher potential, what is t9m1rpla v)7 ophe electric field between the plates?

A. 100 N/C upward

B. 100 N/C downward

C. 40000 N/C upward

D. 40000 N/C downward

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 6.0-mF air capacitor 1dskt 6p6 h)qv /:sxhjis connected across a 100-V battery. After the battery fully charges the capacitor, the capacitor is immersed in transformer oil (dielectric constant = 4.5). How mu/h dqx6jtsh1psv )6k:ch additional charge flows from the battery, which remained connected during the process?

A.

1.2 m C

B.

1.7 m C

C.

2.1 m C

D.

2.5 m C

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A charge of 60 mC is placed on a 15 mF capme-qrdmfp3;bi))q2fw :pnvu yd xr 4 :c 59.nnacitor. How much energy is stored in the capacif)uec i)b3dv2pmyr wn :-r;pf5n.:qq 9dm nx 4tor?

A.

120 J

B.

4.0 J

C.

240 m J

D.

120 m J

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

20 V is placed across a 15 mF capacitz :x1.zp(h5/qt 4(jm w 5lqs:cvyezuxsn + )reor. What is the energy stored in the capacitores pq):wsh( uey/ qnj: xl4 1.55cmzv+z(xzrt?

A.

150 m J

B.

300 m J

C.

3.0 m J

D.

6.0 m J

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A charge of 2.00 mC flows onto the plates of a capacitor when it is connected tohug;cmwk( biz; n1uari,e7-8 a 12.0-V battery. How much work was done in-(ku;h ;1brnum zgeia7ci, w8 charging this capacitor?

A.

24.0 m J

B.

12.0 m J

C.

144 m J

D.

576 J

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a 10-mF capacitor is cha06 h9y7bwy fd*hj;k,-ahwtz urged so that it stores

2.0 \times 10^{- 3} J

of energy, what is the voltage across it?

A.

5.0 V

B.

10 V

C.

15 V

D.

20 V

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor consists of plae-xl --w mgmeiac74. htes of area

1.5 \times 10^{- 4} m^{2}

and separated by 1.0 mm. The capacitor is connected to a 12-V battery. What is the capacitance?

A.

1.3 \times 10^{- 15} F

B.

2.6 \times 10^{- 15} F

C.

1.3 \times 10^{- 12} F

D.

2.6 \times 10^{- 12} F

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor consists onh;ga(cgya1gy- h* 8h y 5g7)dtd4xz af plates of area

1.5 \times 10^{- 4} m^{2}

and separated by 1.0 mm. The capacitor is connected to a 12-V battery. What is the charge on the plates?

A.

1.6 \times 10^{- 11} C

B.

3.2 \times 10^{- 11} C

C.

1.6 \times 10^{- 14} C

D.

3.2 \times 10^{- 14} C

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacddjjf5c(o-wd9q ;v30du kcq*itor consists of plates of area

1.5 \times 10^{- 4} m^{2}

and separated by 1.0 mm. The capacitor is connected to a 12-V battery. What is the electric field between the plates?

A.

12 V / m

B.

1.2 \times 10^{2} V / m

C.

1.2 \times 10^{3} V / m

D.

1.2 \times 10^{4} V / m

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor is constructed with plate area of+a9)1cta e znx,oen+w

0.40 m^{2}

and a plate separation of 0.10 mm. How much charge is stored on it when it is charged to a potential difference of 12 V?

A.

0.21 m C

B.

0.42 m C

C.

0.63 m C

D.

0.84 m C

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A parallel-plate capacitor is constructed with plat7w7v/ zm7g gxiwnz90k e area of

0.40 m^{2}

and a plate separation of 0.10 mm. How much energy is stored when it is charged to a potential difference of 12 V?

A.

2.5 m J

B.

5.0 m J

C.

7.5 m J

D.

10 m J

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-mF capacitor is connected to a 50-V battery and becomes fully char/ 36w;zxwrbv4 gl2.fn bgd xw0ged. The battery is removed and a slab of dielectric that completely fills the space betwlzd n/bx f;4 63 v.rgwg0w2bwxeen the plates is inserted. If the dielectric has a dielectric constant of 5.0, what is the capacitance of the capacitor after the slab is inserted?

A.

75 m F

B.

20 m F

C.

3.0 m F

D.

1.0 m F

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-mF capacitor is connected to mtmt4l:nc.-/cmjn; x4r5 r. ; norzpia 50-V battery and becomes fully charged. The battery is removed and .l4x/ncpn;c :i -;m tz.j4mor 5trm nra slab of dielectric that completely fills the space between the plates is inserted. If the dielectric has a dielectric constant of 5.0, what is the voltage across the capacitor's plates after the slab is inserted?

A.

250 V

B.

10 V

C.

2.0 V

D.

0.75 V

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