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

1#

Which of the following is not a .5 uu:3quh, i:wbauxyvector?

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 coulomb is aq-7 irtd7q-e u

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 thei.x*v2 cvp3 8:0 ijmxm ndpog9lr surroundings. Object A has a net charge of excess electrons. Object B is grounded. Which object is at a hig igc:p3v 2*lpmomn0 j. 8dx9xvher potential?

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 inr2,87) o yyqajl /oqkl the direction of the electric field

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 direction4+y8y*b wxtssbz i o:7+zoqc , opposite to the electric field

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 placa /xfpxp,bv65:jt m isas6- 2n0 4lwxmed 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 accel7lshwg7-8xxyz(wzx *3zh k7werated from rest to a speed v by a 500 V potential difference. If the potential difference is changed to 2000 V, what will the new speed of the ball be?zyl (3hghx8 wwk w7*7-zx sz7x

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 javw w0:23y 0+lykedt at the same potential 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 point B along an equipotential suxjlf0g:x;5 4m3fo+ r+jo dxkurface.x+of 4dm fglju0 :35xxr;+ojk

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 musyu6 d87ur.hw- y74mgjpf5 8.dxobg a it 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 carrying a charge equal to that on the electrttc3 w 74xp mnj fs49zwsm-r;/r+sn5 uon as a result of moving through a potential differezwc 5+s w4n m37n-s 9rtpt fj/r;sxu4mnce 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 awvf wxo5h4c mzc4qy6,u fryloo:/5:+ unit 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 correspon s-1j;g8c epomds to

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 a disl-h cm;ww024: p x/wh9pfibgvtance of 2.0 m from a positive point charge is 100 V. What is the absolute potential 4.0 m away fr f4/wxm p9pib-wgw20 hc:h ;lvom 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 i (vaey58eosumrw2 2 ii7ht3 2-100 V. What is the absolute potential 4.0 m away from thev(uw syii72m3h te2825eroia 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 t+a ,x0qe4*ozr ybvi9the exact center of a square is 3.0 V when a charge of +Q is 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 chargtv90zy qx*a ,orie b+4e 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 thez xariri *,-j):; rman center of a square is 3.0 V when a charge of +Q is located at one of the square'r,n :-;xi m *rra)zijas corners. What is the absolute 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 always consir:ganum y 050ist 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 ilu/4s98x:ur dlkvgdh: d*;tcs a

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 capacitor8iv 3c+m afbfwegyo0::)n bhe: nji01s are identical in every respect except that one has twice the plate area of the other. Ifogjih :bf0wm e:)3eny+bvc i 01n:f8 a 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 capacitancqbb ip28vs7z 0(qh9*c3kd x:z vyfng+e of C. If the area of the plates is doubled and the distance between the plates is halved, what is the new z+392pzx v0*f(v cbb7sqnhg kqyi d8: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 62z eg z5eu3uk82h . igogiu.gt1tao(then is removed. The 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 thh6 (ge3ikzu8t1z5i2.ogatuoe 2.u gge plates as they are being 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 weadmydm5 0vya , t-,+dsgkened, the capacitance of th0my+dddgs ,a 5 v,ym-tat capacitor

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 ma/60i-ij v58cy5 nj ,mrqujkhuintained with constant voltage by a battery as they a rkj-juqiujn85cm0,5 hy 6i/vre pulled apart. During this process, the 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 maintainedjbst3 ecc1 *;k with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this prock scc;t e*b1j3ess?

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 dielectri q r(9x( -h--wqpyumwra/ fp)uw 8ly3vc material between the plates of a capacitorpwxu( u9r-yqayf-(l3 h w) q/8-mvwpr.

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 such as paper is placed bed/p sg( 9rhgv.tween the plates of a capacitor. What happens 9g/(hp.dgr s vto 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 placed between the platle/r;ri ,p1 ipes of a capacitor holding a fixed charge. What happens to the electric f/ iperilr 1;p,ield between the plates?

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 battery and h65 f3;e wcpi iow,op7becomes fully charged. The capacitor is then disconnected, and the separation between the plates is increased in such a way that no charge leaks off. The energy stored in this iif,hpc;6o wo5e 7w3pcapacitor 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 h)srw,pvzoitu2 ; 6q w*olding a constant charge causes the energy stored in ts pu)vq*ri6ow w, ;z2that capacitor 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 capacitor causes the enehwqa;joq50j2o+ uo pmx7au4;rgy stored in that capaauj7; j po4 20ou5+;oqmawhx qcitor 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 move 10 C of chft2c7l+1w+ fl 15rpc,ympcjk arge from point A to point B. What is the potential difference between poin+ ctlyj2l 1pc, f+rpk5f 7wm1cts A and 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 point A, v/( l 5upyl/*anme izjl-2y1 wwhere the potential is -50 ypjza2mn i(lv l5w 1l/ye*-/uV, to point 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 at rest, is accelerated tzqlkl 5+;d 5d(d,mgbthrough an electric potential difference of 500 V. Whadg(dl + mql,5 5btz;kdt is the kinetic energy of the proton?

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 accel*9,cd3xw6 r. dg 5khuwjhcvz-erated through an electric potential difference of 500 V. Wh5z .9gx6-wvjc,r*3 dhdhwuckat is the speed of the 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 xu(md6djm2r/n )xnc; proton falls through a potential difference of 1200 V. What speed 2njd(;6xmm/cnr dx)udoes it acquire?

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 9f-rw1wm e p7 kj3otr i4e+4-pw.0 V do in 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 throuker fmn-g9rdsymv6u 1 5 1+l)mhr/e.a5t8xqkgh a potential difference of 500 V. What is the velocity of the r515hxnqkavs+1rem /df ye) rmu.g8ml 6t9- kelectron 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 of 20 mC. The object is accelerated from r o,duk lz x2;py:k0tthje+w0, est through a potential difference, and afterward u kxh:0yepw ,j dz o,k;2+ltt0the 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 maintains the electrical potent/r2omvv)o(/j:xncx nukp : 9zial difference between two parallel metal plates separated by 1.0 mm. What is the electric field vckz)mpx2(/: xnr9uv / oj:no 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 oko (myf*2c, s2n/cfli f 500 V/m, is directed parallel to the +x axis. If the potential at x = 5.0 m is 2 fi cmnf*2kso/ (,l2yc500 V, what is the potential at x = 2.0 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 directed t-f8u q hkva9abboa- 9.oward the east. If the voltage measured relative to ground at a given point is 80 V, what is the voltage at a poin 89va aha f.bkoub--q9t 1.0 m directly west of 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 the direction of an electric field of magnif e )l/-q*z rgct7lz;ttude 3.0 V/m. What is the change in kinetic energy ofrlg -lct;7*q/fz z et) 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, separatedwd:jx2 9gi a2a 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. When the electron arrives at a distaa w92d g:jax2ince 1.50 m from the positive plate, what is the potential difference between 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, separated by 0.20 m, are connecteddnep)5ng 7 tye-z;ss2 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 0.050 m from the positive plate, how much kinetic energy does thtnens 7-) y5zd;e pg2se 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, are connected to a 12-V b(u2u d;h hm40 6tg5amc0pe5u awbh4gqattery. An electron released from rest au (a60mp5u bha;5 ch2td0u4 gmq4ewhg t a location 0.10 m from the negative plate. When the electron arrives at a distance 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 sp+p 0,bdxj5qn+3v)bxff nl0 toward the east. If the voltage measured relatijl,nf3+nx dsfb0q pv b+ 0xp)5ve to ground at a given point in the field is 80 V, what is the voltage at a point 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 di6m)i57hfsk ,i.i)z pofyg 2iw rected toward the east. If the voltagfk iw 57,z6.pi)s)yoi gmfh2i e 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 differenkga pz-72tojuk l-7t,ce of 12 V, it will acquire a kinetic energy (in the abo2tkzpa -ukl7 7j,gt- sence 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 75filr+uv ,y8oupzk 2 a distance of

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 the ends of a metermd,dq 3n ou8l* stick. Find the electrical potential fo3qun,mol8 d*d r the center of the meter 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, 0) and a -/)zv*h qg xg8k2.0-nC charge is at (3.0 m, 0). If the potential is taken to be zero at infinity, what is the electric poth * z/8qgxkg)vential 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 at (3.0 m, 0). If xbgd-( xx0y.t*) ewef y*(lh(qi rhd1the potential is taken to be zero at infinity, what xxw(* 0e l .ebr(yh )y-d1tghf*dqxi (is the electric potential 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 at (0, 0) and a -2.0-nC charg:,atr k r,rg3qe is at (3.0 m, 0). If the potential is taken to be zero at infinity, what is the work required to bring a 1.0,qrk:ta ,r 3gr-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 rernm ( erjm77*nctangle of sides a and b. What is the potentimn m* (re7r7njal at the center of 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 opkkmwm+ceb)6sz7 7c tmn hvy:837-r le)wxb8f posite corners. In the other two corners are placed charges of +3.0 mC and -3.0 mC. What is the absoxzs)l v7tem3mrbc wf- +: 7eh8kmy) 8wn6k7cblute 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 (charge +2e, maek h 8s iklx8nf7)d5z(sk6ut 9ss

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 placecb;,gs *op kf ,7d2xypi45lqr three charges, each of 2.0 mC, at the corners of an equilateral triangle of side 2.s;x 5dlpg,2p7b*yo cri4, kfq 0 cm?

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 ig/0l,h8 tybr v3ymn3 it is charged to 1000y3/g,nv 8hbtlmiy r3 V?

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 has platesuh.zt hdhvtrd(jnj..45nd))s/i4v f 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 txawp2q ge u,:1he plates are separated by 0.050 mm. If the capacita1qpux,we 2ga: nce 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 hasdc.jc.b7gn:f 4yd g o4 ,ezw.f 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 ha 3 d1d:kgyjcw*s a plate separation of 5.0 cm. If the potential difference between thd1 dgkjwc *3:ye plates is 2000 V, with the top plate at the higher potential, what is the 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 is connected acroc1es p;vblel yyg)0 xrz:;5 )fss a 100-V battery. After the battery fully charges the capacitor, the capacitor is immersed in transformer oil (dielectric constant = 4.5). How much additional :;es) )bpervy zl1g05fyl;xccharge 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 aj pkk7t)zc.a ght)rks of,0)( 15 mF capacitor. How much energy is stored in th 0 )zpc( rkfh7.okktgsa)j)t,e capacitor?

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 capacitor. What is the energy stored in the capacw.box8h37 gwoabqbak *1oi9 l3- 4kumitoru-xbiqo3 wa*4 k8 9oam bgb7o.wk3 lh1?

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 flo;/7:twohajmi/ vi*p nws onto the plates of a capacitor when it is connected to a 12.0-V battery. How much wit/h a*vj/piow ;m7:n ork was done in 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 charged so that it storl1)5s; .v*rjmwxkv c1snk 9sies

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 capaci o0iy4v7dasnnd7 lj::mif-1ztor 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 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 of plaiukqoj+m gqp+,d2. zi6(z(l ptes 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 capacitor consistv( j(raq wj;wt*cdob)qk34h5 w.uy m7s 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 construct)ys mf 3tpa9r3ed with plate area of

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 con j*:af9 uwfsf,kox1 mjxs( o8/structed with plate 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 .9+f 3uh:fsrme 9otq acharged. The battery is removed and a 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 :.fa rsfh eo9t9q+ u3mcapacitance 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 connecos46 nna;m4.h5-jdtrjkq ke2ted to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric tha n6jhetsnq 4omk;d42-5. ajkrt 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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