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

1#

Which of the following is n/c*hw9u 7t da-s;qyicot a vector?

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 coulombnj.i v3)g8mc. u)jtjnp 2kf-x 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. xc 8kdslm d9lig5;+;p Object A has a net charge of excess electrons. Object B is grounded. Which object is at ;g5+ l8clx 9 ;mdkisdpa higher 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 in the direction of the electriwf mb*rws+wroq4z+/dkw,:6sy g hj5 *c 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 direction opposite to thea1ip(i f u4k9g 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 placed on a hollow c3h(6blh9r yrp5 jr y3onjpl3- onducting 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 ag.bbf g(ysm rl .z9/h4 500 V potential difference. If the potential difference is changed to 2000 V, what will the / (h9syr lgmfb.b.g4z 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 potential islof3kq,h5u1b9p agw lmqd2f )ih5p/1 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 qjk;zhsn k(:hyhum+ 7 19g1t7ax0hjm moved from point A to point B along an equipotential surface.+uy1:(xmgh9qh s7 0 m1z7;hjj kthnak

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 r6.ll9sng4bb m 0k9ximust 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 charge1 ,nki8aarvl1f6 2wta y4ac :yeer)j1 equal to that on the electron as a result of mov 6rwt f 1c)l:1er,ak j1 aya8nv24yaeiing through a potential difference 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 nydc bj02a szz53si- 5a 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 corresponds tozv* rnf3pr/b 3

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 distance of 2.0 m from a positive pointtyjxw1/hg1q; charge is 100 V. What is the absolute potential w1gqjhx1 /;ty 4.0 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 poinj t6qt.6b2 d-3h9smz slfmh/zt charge is -100 V. What is the absolute potent 6fl9s-s3hm6d /zmbh ztq.t2jial 4.0 m away 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 the6yi nbn+*tw 5n exact center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What iynni*65nb+ wts 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 a 0tvlwdp( b6uih e)t/- o/m7cvt the center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What is m biu dw0(tclo 7 v/6ph-)/vetthe 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 consist of tuf e9)l558..ecv thqut-q 9adb y h-gtwo 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 in:(wing leik. r +sp *1hkgp95s 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 capacitors are identw+dz ms 6+c;.sa7gzea ical in every respect except that one has twice the pl;+gm+.7as adsez zc w6ate area of 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 i qd 06d.e.nahcs doubled .qehcd.a6d0 nand the distance between 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.gnhb -;z2m7 7 k+niolt The plates are immediately7b;2kl-omtign n7 hz+ 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 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 wzsi8h: ij4/v bv u92a4(ldkda given capacitor is weakened, the capacitance jiv4v2 d 4uhi:98/( bzdka wlsof that 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 maintained with cu/e p+t- zwpqeuh.c yiyq8125onstant voltage by a battery as they are pulled apart. During this process, the amount of chpupq t2yh8z/c1iye.w eq5u -+arge 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 maintu nghcarz57gc1p6: ;a ained with constant voltage by a battery anccha u: gg16z;5apr 7s 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 fatbfh5l uq4.-.* vo cuor adding a dielectric material between the plates of a capacio*u.u af- v4 qtclb5h.tor.

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 6t498tdx (ps zsfz dh)as paper is placed between the plates of a capacitor. What happens to the capacit4sxphzf(d s)9z8t 6 dtance?

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 th u7t6qo7y8kgte plates of a capacitor holding a fixed charge. What happenky778uottgq6 s to the electric field 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 becomes fully chargedcx q+p *,: q9y6nxq52uhu* fc7ipnix t. The capacitor is then disconnected, and the separation between the plates is increased in such a way that n nxc6x i+t*qh2qu:i q ,p*nxyp7f95u co 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 k8/hi( yz3iplc /3q gicharge causes the energy stored(/il igc ziqkp3 8y3/h in that 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 yoq3q kekz 4;5+g.gn,z 9xprg energy stored in that capacitor r.+o ;xz4p qkg3e g9z 5kq,ngyto

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 t agd8us ;w 4)t f0epc1bhn:egxm7b4) 10 C of charge from point A to point B. What is the potential difference betweenxu7 1wed;: pmbgasc het4tn )8)fb40g points 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 poia z)7lp-o)jxl -;q quvnt A, where the potential is -50 lo7uz) q )jax;lp- -vqV, 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 through an electricfrh5bs 6f- kzq k5bv(/ potential difference / sf5v-hk(kf5r6bzb qof 500 V. What 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 acceleratedb h.jvz4h19t/ qm4xu/1dey zj 1+zrnz through an electric potential difference of 500 V. rt9+ hzvd/.qzny jm1 e4z4z1/h jxu1 bWhat 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 proton falls through a potential difference of 120zmxy9+ 7j7rm+ looi 7y0 V. What speed does +jrm+9oi zymo7yx77l 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 9.0 V do in moving j341w) pq lhw68agbvo):yqz j

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 through a potential dpja ih/3+-1q0tp1jh v gh0p ovifference of 500 V. What is the velocity of p10+qji1jvh- 0 hpat/ 3gvophthe electron 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 accelera giwdeks *9h31ted from rest through a potential difference, and afterward the ball is moving at 2.0 m/s. What is the m wki eg3h9*1dsagnitude 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 potential difference between tc9 16cbjo+, bgwno,phj)d-n cwo parallel metal plates separated by 1.0 mm. What is the electric field betwjobpb 91n+gjo -ccd,n h6,w)ceen 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 fy m: ,g5w69(u* wci rgrvkbi+yield, with a magnitude of 500 V/m, is directed parallel to the +x axiumrr i69cy+v*b (w5ig ywk,:gs. If the potential at x = 5.0 m is 2500 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/Cy0 bkb7n4y23u9hok rw directed toward the east. If the voltage measured relative to ground at a given point is 80 V, whkb 24 wr37 ynh9uo0ykbat is the voltage at a point 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 alonggnd0bn 62o: 9jhnjd,q the direction of an electric field of magnitude 3.0 V/m. What is the change in kinetic energy of the protonj9 2 bhn:g60jqdod,nn ?

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 connected to a 12-V battery. Anf)vqscr0r97 xz sdz )kb86c3 f electron released from rest at a location 0.10 m from the negative plate. When the elkc 6f8xsq)7r dsf90vz) r3bzcectron arrives at a distance 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 connected to a 12-V + z7rbf;y-xfwl yp2*u 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 platy *-przu;+f lb72fyxwe, 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, are connaq7 vu9c1b 2myected 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, wh9 cba2myv1qu7at 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 electru7.u ea +hou,ric field of 50 N/C directed toward the east. If the voltage measured relative to ground at a given point in the field +ouua7.e,u hris 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 ;-xnc /r0b4x ryxbq nda3;)quN/C directed toward the east. If the voltage measured relative to ground at a given point in the field is 80 V, what is the voltage at a point 1.0x-a;dn3b )n/cyx;q0rq urxb4 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 differenc9nx37khy r l;nbjk/6/ o gc166hfm4g4ofr prwe of 12 V, it will acquire a kinetic energy (in the absence of friction)ro4r /9n1fw hfh6gyx jr6 mbn4k7lk/6p3c og; 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 potentiaaz yzcpho2kk :78k*-5a6z q wfl at 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 meter stick. Find the elecn24,bssu 6,rhv zt(g qtrical potential for the center of the meter sticv6 g qns(b4stzu,,rh 2k.

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 -2.0-nC charge is at (3.obaq;heg k8w9 bw7.n tifl1 280 m, 0). If the potential is taken to be zero at infinity, what is the electric potential at point (0, 4.0 mn gohw;lbq8i21e7 ab. tf89 wk)?

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 4 7kwzi)3njv4dizw1m:c 8gxf(3.0 m, 0). If the potential is taken to be zero at infinity, what is the electric po) wzzmidixc:n4 731g 48f jwkvtential 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) u v81c7)qnp52ts:*f e*ntv psbi t3h hand a -2.0-nC charge is at (3.0 m, 0). If the potentia *s2v n:s uvtb 5enchfp*h1q7p83 itt)l is taken 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 ksgp. 6(gpr88jz0zjd corners of a rectangle of sides a and b. What is the potential at the center of the recta8 pj jgd0.(z 6rpzgks8ngle 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 twodvb:z wx7b6nu y 7g:(j diagonally opposite corners. In the otj7gvw7ud: bbny6:( z xher two corners are placed charges 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 (charge +2e, masr14 raksbr2 sx,xb p/+s

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 chargespi+pwfmwe h c9: )1y2r, each of 2.0 mC, at the corners of an equilateral tre pfc):+rmwp19wh2iy iangle of side 2.0 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 the5c * ts4pwe 4xy-/erij plates of a 2.0-mF capacitor when it is charged to 100c p/s 4tyej4x*w5-e ri 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 platioa, ;bo 3hv: -db-gcqv jn8c8es 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 fillx9c v tt.1fz5ped with air, and the plates are separated by 0.050 mm. If the capacitancp t5.cfx 91vzte 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 has plates of a v*puh ;dbu9qn;5/rm urea

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 thlmwwk.i7(r6c)q9t4smn 5 v ule potential difference betwee tuv9 w(6lr47lmq) n5wmc. ksin the 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 across a 100-V battery. After the battery hv :c7dgwlw:e+se ::ufully charges the capacitor, thd 7hv:sgu+elwe w::c:e capacitor is immersed in transformer oil (dielectric constant = 4.5). How much 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 capacitor. Hoccdvi8x6jr361f 7 ljtw much energy is stored in the caf13vlj dtrjc87cx6i 6pacitor?

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 j-fnj ohn* bz2j20kki7zvu a3t:6:tnis the energy stored in the capacijz n7:- ju akikjh*06bt22:ntf3 ov nztor?

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 capacyqo ysny07g d 4j)o/2tpzjxk+cm-2u8itor when it is connected to a 12.0-V battery. How much j s 0kd228z+yyxcqu j -)tnp7mo4gy/o work 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 s)xdcjj9pg h-lcp1ribvmw68yomd6 r;96 4le3o 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 conshz7cx ugrj6x ;/.g-bjists 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 capacitog+n* sye epm)/q9nohz )i33wh r 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 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 consists of plates of area mh f+r emcsp. s07mhqu.oh.,*

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 constructc8+hxiyn9ncv,u bw 7ce+bp 4b.mf49eed 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 constructed with plate area o/ 4ah yq 6zjx:otppb8 alh1:0qf

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 chargedd*(*u3. qhd lrnbutn (. 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 capacitanc3 (lnrhtq*.du (b*dune 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 a 50-V battery and becomes fully cha-nnff 6eo rn3vpu*fq ;3.n(*, dvjbdarged. The bataj* npvf6d ;33,nfer .u(fnno-qdbv*tery 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 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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