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习题练习:Physics Unit16: Electric Charge and Electric Field



 作者: admin   总分: 82分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月15日 13:36  切换到: 整卷模式

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1#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of electric ch1 vqnfbhe*oi;)0moda/5te - farge.
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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for two negative charges to kfuy/:jd c4 h1attract each other?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a positive and a negative charge to attract eacy89 i.(zy p-(bya xtysh other?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A glass rod is rubbed with a piece of silk. During the proceh bg+b4pv:to+k0 )a4 pmfh y+seon:c:ss the glass rod acquires a positive charge and the sils4hco:0yenkm+hbfp4 ot +:bpa:v +g)k

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton carries a

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The model of the atom i e9, y*4,u w5m(jasu lo9mvopshows a

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A neutral atom always ;ka8fnbm58 7 klyo7dj4pjc sc ,rx0;fhas

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An atom has more electrons than pejag;*ryyo 81 rotons. The atom is

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Materials in which the electrons are bound very tightv btv,.c)v 9k/an34u iw4ryjtly to the nuclei are referred vnr 3u.kat iv)jvt4c,y9b/w4 to as

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Materials in which the electrons are bound very loosely to th6 kykuuo90sr 9e nuclei and can move about freely within the material are reouu0 kk yrs699ferred to as

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A negatively charged rod is brought near one enz53.g qu .gqcily:oc2b d4w 7ld of an uncharged metal bar. The end of the metal bar farthwl .b:dqgo c 7.cq3ziy45glu2est from the charged rod will be charged

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sphere A carries a necjo1l yxyo fy 7d*y.l*(gug19t positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly toucheddlyoyjxo g c y*.9*1y(f17l ug with a wire that is grounded. Which statement is correct?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How can a negativelyp;i .2erjmo +.s7*i l *gawdai+wkzt) charged rod charge an electroscope positively?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An originally neutral electroscope is briefly touched with a positici2m-+ 5wp 4dqykpio(vely charged glass rod. The 24 p wcm(ioy dqik-+p5electroscope

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An originally neutral electroscope is grounded briu 12c;bcqzdp g 5;gk:eevs/k o9i8ek+efly while a positively charged glass rod is held near it. A5z dv;+ ccei8;gu /skqe ebg1pk9:ok 2fter the glass rod is removed, the electroscope

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A positive object touches a neutralbeo t c8dc*- gwqs:kh+ 7l+vdz5/uk,c electroscope, and the leaves separate. Then a negative oltoc5/ ,gwdvk8+-cdq7hcs*k :zb+eu bject is brought near the electroscope, but does not touch it. What happens to the leaves?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A large negatively charged object is plac;-9swpvg0zw4h 5ia/ /coqmr ked on an insulated table. A neutral metallic ball rolls straight toward the object, but stops before it touches it. A second neutral metallic ball rolls along the path followed by the first ball, strikes the first ball,gp a 4m 9/ v/w5;woq-hcszkri0 and stops. The first ball rolls forward, but does not touch the negative object. At no time does either ball touch the negative object. What is the final charge on each ball?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Charge is

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What are the units of the Co i13l0qlc, ffek-o+ euulomb constant $k$, which appears in Coulomb's law?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charged objects are sep( 8flyo nhm8i; j/y8unarated by a distance d. The first charge is larger in magnitude than the se(i y/8um8hj8;nf lonycond charge.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sphere A carries a net charge and sphere B is neutral. ,qvx3q92o*a7ugioq( o/a( dsg0wm c a They are placed near each other on an insulated table. Which statement best describes the electrostatic force between tv * o ogga2 90cqaqus/a x(qo(m,di7w3hem?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charged objects attract each other with a certain czo,m.z0) vu3th(j il e0e xo7gn0k v)force. If the charges on both objects are doubled with no change in separation, thc0u3ot vzhzkie gl07o(nv, )0jme ).xe force between them

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charges are separated byxoh 6ut 7v,zn. (5kgmk a distance d and exert mutual attractive forces of F on each other. If the charges are separated by a distance of d/3, what are the new mutual forcv .ok,mnk567xzth(gu es?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charged objects attract each other with a force F. What happens to the foyn.eu.y8induum5ui r 0;7o p3rce between them if one charge is doubled, the other charge i5 i.n y;7yru8ud ep0mu.3unois tripled, and the separation distance between their centers is reduced to one-fourth its original value? The force is now equal to

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron and a proton are se0 lny,aq2 (in/ y6csqcparated by a distance of 1.0 m. What happens to the magnitude of the force oc(6yc,yians/ l 20 qnqn the proton if a second electron is placed next to the first electron?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron and a proton are separated by a distancu9t wwtpl+f,0h)zybg3qwh c8q8d f 6 ,e of 1.0 m. What happens to the mcqt,w 9uq hb fdwz3t0+y8l8g, hp)w6fagnitude of the force on the first electron if a second electron is placed next to the proton?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron and a proton are separated by a d0x -wk lkgjf ipkl24/6hr.133a zqpojistance of 1.0 m. What happens to the size of the force on the proton if the electron is movf j 6lrq31l2pj3k0iogxw/h 4 kp.azk-ed 0.50 m closer to the proton?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point charge of +Q is placed at the center of a square. W-jrn( -n 1zds/dc9gt;6mbu mthen a second point charge of -Q is placed at one of the square's corners, it is observed that an electrostatic force of 2.0 N acts on the positive charge atd9( sgj;zb/cdt ntmnu-m16- r the square's center. Now, identical charges of -Q are placed at the other three corners of the square. What is the magnitude of the net electrostatic force acting on the positive charge at the center of the square?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point charge of +Q is placed at the centroid of an equilater80 j 3h(zvkx-vby 7yrv//kwua)l- cthal triangle. When a second charge of +Q is placed awrajyuy0 7hc kz(v -- 3v/bhxkv)8lt/t one of the triangle's vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of +Q placed at one of the other vertices?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is not a vectorn)jp wwth h7o,yzg- -n71hrbnj:8k; z?

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At twice the distance from a po0zc3 8 zs414)aaugtrbt 0p+dswwyg6rint charge, the strength of the electric field

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible to have a zero electric field value between a negative and p2d8 x9xc we2plh.m3 qsositive charge along qe. hdwl2m92 c 3xs8pxthe line joining the two charges?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible to have a zero electric field value between two positive charges+x/ o5b *fcz-.lsqy vpu7mr0r along the line joining the two chargcq r xm * f.+vopsy/bur-l5z70es?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electric field lines near psitive point charw0g;jk9guuky 63r( y eges

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field shown g6v5 u/3w8tnvk0enia h(+(c4babhle


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can electric field li*m-3lif*pt k6go 0womnes intersect in free space?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solid block of metal in electrostatic equilibrium b9kgz2xg0o+/a+zf6iuty w : f is placed in a uniform electric field. Give a statement concerning the electric field in the blo /f+6b kax+g:if gzzuwyt 902ock's interior.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a solid metal sphecehkb hbv61* 5lt7cj1re and a hollow metal sphere of equal diameters are each given the same charge, the elec tc71ek6hjl*1 bvbc5htric field (E) midway between the center and the surface is

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cubic block of aluminum rests on a wooden table in a regiot 2ozfga/94xun where a uniform electric field is directed straight upward. What can be said concerningzt4xf gu 9/2oa the charge on the block's top surface?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a conductor is in electrostatic equilibrium near an electric chos*m( q7(b )gfo: fdleqq-nt:arge

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A positive point charge is enclosed in a hollow metalli67 ugqpal:d:ldf8lu7x 7y4 slqh s*v8c sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a poiq*6:p7uaus d88lf lqx 47ylhsgld: 7v nt directly above the hollow sphere has

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42#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State three properties of condc4c )6csvp1 3elr jnu ;,:vgqnuctors in static equilibrium.
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43#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Gauss's law.
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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The charge carried bz 9ed rbkk32 vj2o0npqwj43,i y one electron is $e = -1.6 \times 10^{-19} \; C$. The number of electrons necessary to produce a charge of $-1.0 \; C$ is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A piece of plastic has a net char9svkz (i:x 0k-) t+ip4 lrecalge of +2.00 mC. How many more protons than electrons does this piece of plastic have?p4 a-(xtez +irs 0c)i:9vllkk

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the charge on 6wnokwcua61,h0 b,:f9 pn sum1 kg of protons?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An atomic nucleus hasftp4:ewgvm ury00 9 0s a charge of $+40e$. An electron is $10^{-9} \; m$ from the nucleus. What is the force on the electron?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges, separatylx5r1)1vri h tch :/led by 1.5 cm, have charge values of 2.0 and -4.0 mC, respecti hlr: ciyxhtr /)115lvvely. What is the magnitude of the electric force between them?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-C charge is 15 m from a second charge, and the force between thz asb/ 1;,ozqoem is 1.0 N. What is the magnitude of the az;o,b z1q /sosecond charge?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two 1.0-C charges have aqmrqd y 2*yp 0g46ivi0 vj*gi)ip)r9j force between them of 1.0 N. How far apart are they?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force between a gd8 ha x:dj( j0u)uk3 blgzu(+$30 \; mC$ charge and a $-90 \; mC$ charge is 1.8 N. How far apart are they?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges, initially 2.0 cm apart,baid5c/w p70/(ctow8yj ( ejp experience a 1.0-N force. If they are moved to a new separation of 8.0 cm, what is the electric force betwdj a85/tyw (ioc07ejwcp b/(peen them?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three identical point charges of 2.0 mC are pn9 u /5qwgfipsc)1il/; ps 3nwlaced on the x-axis. The first charge is at the origin, the second to the right at x = 50 cm, and the third is at the 100 cm mark. What are the magnitude fns59uiqi/3) pww p s/n;cl g1and direction of the electrostatic force which acts on the charge at the origin?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three point charges are placed on the x-axis. A charge of +2.0 mC i-ygnq m wjde,7+kf5k5dj*x (hs placed at the origin, -2.0 m C to the right at x = 50 cm, and +4.0 mC at the 100 cm mark. What are the magnitude and di*j hgkq-e,5wy dm7nfk+d jx5 (rection of the electrostatic force which acts on the charge at the origin?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three point charges are located at therkym/tk d:l5ac0he0:o n7hi8 following positions: Q1 = 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.00 mC : l7drco5k ekh/yi:0mt8 n ha0at x = -1.00 m. What is the magnitude of the force on the 3.00-mC charge?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point charge of +Q is plac d5y is3hg5irt,.tk0 dnmp2 )yed at the center of a square, and a second point charge of -Q is placed at the upper-left corner. It is observed that an electrostatic force of 2.0 N acts on the positive charge at the center. What is the magnitude of the force that acts on the center charge if a third charge of -Q is placed d3pgttih n0,s i5d)y my.kr5 2at the lower-left corner?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Q1 = 6.0 nC is at (0.30 m, 0); baognho..-c7 Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of thn7och. -bg.oae net force on the 5.0 nC charge?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is : mj; jzzoar +e)m +uf eqe,9bflpi12:at (0, 0). What is the direction of the z;+)jiafmr 1b ,o:2pmz e:fe9q+leu j net force on the 5.0 nC charge?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three identical charg0n/jaly/zwo 6 09 xngp u8, djuni,t,5f dij6ses of 3.0 mC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic da x6o/d9jy5nn gnt0,,/uu,w j08 jf6lizi psforce which acts on any one of the charges?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider point charges of +Q and +4Q, which are separated by 3.0 m. Att5oo2 a kp,yc0 what point, on a line b,yo5po2a 0tk cetween the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A +3.0-C charge is at the origin and 3tm)w-9od t) r)pjex wa +9.0-C charge is at x = 4.0 m. Where on the x-axis can a third charge be placed smo9) x))-ww3 jrpedt to the net force on it is zero?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Charge +2q is placed at the origin and chargeo -ysmw 0q3 es5g-:gcf -q is placed at x = 2a. Where can a third positive charge +q be placed so that thm s- g:5csoewy03q f-ge force on it is zero?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A copper penny has a mass of m.fgo 70.eh+ pcqkh: tr2c/gd3.0 g. A total of $4.0 \times 10^{12} \; electrons$ are transferred from one neutral penny to another. If the electrostatic force of attraction between the pennies is equal to the weight of a penny, what is the separation between them?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron is held up against the force of gtyghlm+/vi,;t + bi6tmr9 vu.s2q/p*tc cg2w ravity by the attraction of a fixed proton some distance above it.6tvstmtl tg gh2c2 *q/ yibr.+,;i mu+wcp 9v/ How far above the electron is the proton?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two 0.20-g metal spheres arxjps :pn- y.j)opy-y ,e hung from a common point by nonconducting threads which are 30 cm long. Both are giveny.-jyn pps , opy:x-j) identical charges, and the electrostatic repulsion forces them apart until the angle between the threads is $20^{\circ}$. How much charge was placed on each sphere?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An atomic nucleus has a charge of +40e. What is the magnitude of the ele1i xa.uxe4)eb ctric fbi )1x 4ua.exeield at a distance of 1.0 m from the nucleus?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What are the magnitude and directi a hunn;2)2(hq aoe 4weg2q/xmon of the electric field at a distance of 1.50 o2een)qawm na h(q24x2uh/g; m from a 50.0-nC charge?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 5.0-C charge is 10 m from a small test charge. What is the magnitkrb9pe2g o.swl p)koi3(4j7 l ude of the electric field at the location of the j( .opi k gs4379lkworl2eb)ptest charge?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 5.0-C charge is 10 m from a small test char6ya qkfpr7z g(t *lnn4j*qx.8 ge. What is the direction of the electri kqqyl(rz 4f68g 7*n* xta.jnpc field?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 5.0-C charge is 10 m from a small test charge. What is the magnitude of thev0y t c/gu 1vb18wrrr(n.wcl+ force experienced by a 1.0 nC charge 1 cr u(cr8 + wv1yt0lv./wnbrgplaced at the location of the test charge?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges each have a value of 3.0 C and are0q1q::xy/ ; uw abo)j rckgui5 separated by a distance of 4.0 m. Whxi rgob:k u/)q:1 ;ujwc5y q0aat is the electric field at a point midway between the two charges?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 5.0-mC charge is placed at the 0 cm mark of a meter zyd0u (k p5/whstick and a -4.0 mC charge is placed at the 50 cm mark. What is the electric field at the 30 cm mar puk z/w(h5y0dk?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 5.0-mC charge is placed at the 0 cm g1t*,tqkqvs *ag)us 4 mark of a meter stick and a -4.0 mC charge is placed vq ggss 14tkq,*at*) uat the 50 cm mark. At what point on a line joining the two charges is the electric field zero?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges of +3.0 mC and -7.0 mgq/bk0:;tu co tixzmck3+ 95lC are placed at x = 0 and x = 0.20 m. What is the magnitude of the 3o 5tb9kckc:/ l mxi;q +0utgzelectric field at the point midway between them?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three 3.0 mC charges are at 7um /1bw5 u ccy9lt53occ 7apothe three corners of a square of side 0.50 m. The last corner is occupied by a -3.0 mC charge. Find aoc9occw 1 um773 tl5u/5pycb the electric field at the center of the square.

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a square which is 1.0 m on a side. Charges are placed at the corners a8lpul. *ree1 of the square as follows: +4.0 mC at (0, 0); +4.0 mC at (1, 1); +3.0 mC at (1, 0); -3.0 mC 8a1llurep e.*at (0, 1). What is the magnitude of the electric field at the square's center?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N acts on a charge of 5.0 mC wheo1zf fx,.lek gd+dhw ym 71+m)n it is placed in a uniform electric field. What is the magnitu1.kfzo1w +)mddemy7h+gf l, xde of this electric field?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particle with a charge of 4.0 mC hacd hy p/.yziy*wt0.1ms a mass of $5.0 \times 10^{-3} \; kg$. What electric field directed upward will exactly balance the weight of the particle?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A Styrofoam ball of mass 0.120 g is pla9sj(3q+0go52irzp o uaxd-o oced in an electric field of 6000 N/C pointing downward. What charge must be placed on the ball for it to be suspendedpoxd- 52oqo 3jszg0ia r+ou(9 ?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A foam ball of mass 0.150 g cack /f /;cyasy:vf9+ ynrries a charge of -2.00 nC. The ball is placed inside a uniform electric field, and is suspended against the force of yyf akf:v9+y;sc / cn/gravity. What are the magnitude and direction of the electric field?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A metal sphere of radius 1p 7oijn1i -) ee1snjq10 cm carries a charge of +2.0 mC. What is the magnitude of the electric fo1sqi p-e jjien1)n71 ield 5.0 cm from the sphere's surface?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A metal sphere of radius 2.0 cm carries a charge of 3.0 mC. What o 2.l7/utdem jis the electric field 6.0 cm from the center of the sph m.leodtj2 /u7ere?

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