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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: 游客未登录  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 omnkk8p lpk 07o;:,nke dbt nzij9hp - *.7w-rif electric charge.
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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 charg :kobjuj u5:-v.flk8 des to attract 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 each oj/vhmn) o2dbk2v4 q/lther?

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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. l0: onmwngrc(w qe.* 3dfb1+d During the process the glass rod acquires a positive chargelwo r3eddgcw(nnf.10 b +q:m* and the silk

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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 atom3d6vcsc s60 (bj:kfq o shows 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 hasna+yh7fx3fo bf bq d5:r2,rl7ag/ . gf

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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) ;nt;s4*xrj non6:knkmi j5t than protons. 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 electyc:*8k*tvv 2kg:hag trons are bound very tightly to the nuclei are referred8y2h v:g tgtk*vck *:a 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 electrons3g6rs k zj8gtr.r )q+la:7yu-a1dup d are bound very loosely to the nuclei and can move about freely within the material are referred tsdura.3zl8k ) p1 dg6:7ayjrtugr-+qo 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 broudzu- l49xjdl 8jng 355/ee b8xrniq6 yght near one end of an uncharged metal bar. The end of the metady x jr j54l8ned/n6x-e39 ui5gq8blzl bar farthest 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 net positive charge, ayq;w szcxr*da3 b+ :zrfvgh m40n-) 1mnd sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Which -nfbm;w 1dq h+r z*3sza0vyx c4:gr)m 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 negatively charged rod charge an el g9 9,2 kqqyl+kgb)ef;x po)hvectroscope 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 b;pme0dn p 8vwnx(n) 6nriefly touched with a positively charged gla8(xmpvn ;n60den )pw nss rod. The electroscope

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An originally neutral electroscop xya40 8ueu3 vd e//hifzpl3:we is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, t0ywfzx8ep3h/ad3u /iu:le 4v he 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 neutral electr/ zxy wqk7n8 bt-w6*q ceu8cu,v.dk4 ooscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens tq ,/wut*ck7xovu d4-y68kz 8n cqbwe. o 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 plaz;mhnc ,vks 6-db-.z cced 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, and stops. The first ball rolls forward, but doh;.-vd- zm s,ncc 6kzbes 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 tk s:3kij /bu0. vdvk2dhe Coulomb 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 separated by a distance d. The first charge q 4w 5na/45uy wpeuu(wis larger in magnitude than 4q wuwn(5a4 wu5p/uey the second 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. They are placed ndii,nr ey ;rg(-ajw 0:ri2op* ear each other on an insula n*2i-dagipiyj;r:(0 rr,ow eted table. Which statement best describes the electrostatic force between them?

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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 xi,ja9 t),5 ohpp,d mzforce. If the charges on both objects are doubled wxpadz,)p,5 ,tomhji9 ith no change in separation, the 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 by a distance d and exert mutual attractil )ta4z2 0negrve forces of F on each other. If the charges are separated by a distance ofezag42)nr t0l d/3, what are the new mutual forces?

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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 other4ajz1elm5enz 71; cxd tn*h -c with a force F. What happens to the force between them if one charge is doubled, the o t nezzx1-5*eld7a41hnmc jc;ther charge is 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 pro/q,w qbucq;gex-ij 4,d7y8b; w ;awygton are separated by a distance of 1.0 m. What happens to the magnitude of the force on the proton if a second electron is placed next te uj;bqibgg c d y,/w;,-84qxqaw;y7w o 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 a9av, ek: 3ytylvuhd9i: ,v qom2g*-qdre separated by a distance of 1.0 m. What happens to the magnitude of the force on the first electron if a second electron is placedt 99du,-l:h qoa,m *vyykq i 2:g3dvev 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 distance of 1.0 m. Whayuh- emosm 6:c7w, 0mit happens to the size of the force on the proton if the electron is moved 0.50 m closer to the phm:,mocm6e yu0i s7 -wroton?

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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 they*-niy+k9oul0f d ; x1*oasdqt(a ci( center of a square. When 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 thxa1qu+ ooy0f-ncsa(i;i lykt**9 ( dd e positive charge at 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 equilate9 f h/ x* )azm+dmfmid8l6q(vuw7h+hc ral triangle. When a second charge of +Q is placed at one of the triangle's vertice+ mv)f 9z/du xqdmcaiw h+6hh*fm8( l7s, 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 vecto1;c;bq qyc1//tx. qox cb ub7u (s6uhzr?

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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 point charge, the stregy m0r njbw r7 mm+ ih/6rhu+a,z 7vk3z5gs9f1ngth 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 negk; hq b8jvzu,noe3im14qlrx 0 5+t,vvative and positive charge along the line joining ,+v01ib ;vxmqtz le nq8jovu45h3r, kthe 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 ytuo,6ae4o gf. lx0; ebetween two positive charges alongt40,;xea u yol.ge6of the line joining the two charges?

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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 charqklr: 9dwmi i 2c68xx,ye37w r+f;4uh n8pofs ges

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field shp i1ag+g,z2w jtlql.hw( e*.mown


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can electric field lines iv9s7zaln p*2.-w cx5z, nuq)tv pz rt/ntersect 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 is placed in a unifo7) 2nc0uu a/h:i(c8ab do lxoorm electric field. Give a statement concerni 8i()o:d cchun b27oaoaux0l/ ng the electric field in the block'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 sphere 5v69fh: tdwwc8p6 rs:89uo )rrfjtlvand a hollow metal sphere of equal diameters are each givljdrp: 6:wr9v vs)thufw86 9ft 5 rco8en the same charge, the electric 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 reg ( kr v8e6rfmivvuz--9j4s m-gion where a uniform electric field is directed straight upward. What can bemg8 -6vv9r-f sj um eik4(vr-z said concerning 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 x7 mj /;uof70knlyn d6electric charge

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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 metallk2ijt o3vg( o3ic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a3o(gj3tovk2 i point 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 c+ hx-ic(cml 5bonductors 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 by one electron imf/ w/ /s/ljhddw)r- ts $e = -1.6 \times 10^{-19} \; C$. 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 charge of +2.00 mC. How many more protons than ;pvdg ag /gg5 v8i3+lvelectrons does this pieceg3 d8gg5avilpvg;/ v+ of plastic have?

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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 1 k sb4vq;;uerfe lj 5(u)g 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 has a chargjaaunm*e(43den0/ g xe 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, separated by 1.5 cm, have charge values of 2.0 and -4s4pk2k x (vw9i.0 mC, respectively. What is the magnitu4kspikwx( v29 de 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, aegei*-ol d39q/r9uf f nd the force between them is 1.0 N. What is the magnitude of 9-u9 efe3g qiof/d*lrthe second 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 a force between them of 1.0 N. How far apart are theyso+(b8d sre j5y+3sre?

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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 ia,/h fimkw.8s. k tb6$30 \; mC$ 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, initi fid ,l+a:.izzdbn-yqb5t2+ially 2.0 cm apart, experience a 1.0-N force. If they are moved to a new sepzlb y5n-d+ dqz.:af2+ii ,tbi aration of 8.0 cm, what is the electric force between 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 placed on th,u-gm7 8xdmqb e 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 mag7mg ,m8d-xbq unitude and 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 lj7d5g96 ef5yiofq)wz5g m 5ware placed on the x-axis. A charge of +2.0 mC is 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 direction of the electrostatic force which acts on the charg55yz g)jffq5o wgm6 l9iwd 5e7e 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 locat9g- 4-d/ey-uol zey// kto cnled at the following positions: Q1 = 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.00 mC at x = -1.00 m. What is the magnig-kd9 /4/llyzuen -oo et /yc-tude 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 ie7 ehi :9ocos:w dm *+0qu7ncj1mjmq/s placed 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 acdwnhq e+ 1ijje:0q*moc9m7:7mo/s ucts 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 at 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, 5f la-t kwnn;70); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of the net force on the 5.0 nC chargfn;a-7l nkw 5te?

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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 m 0bzug0 sa+t,nC is at (0, 0). What is the direction of th0m zt0+,sbua ge 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 charges ofpysdgr0m2 mf,8 , bmg8 3.0 mC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. rmfg,28dm0,b pg8ym sWhat is the magnitude of the electrostatic force 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, wh5y59uvyxvg 7ln 0wdtu+i p*:/+urmr oich are separated by 3.0 m. At what point, on a line o5v+r+y:5u/x7n t0y9muvu rdlgw* pibetween 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 origp1d,agvoou5/ p6q m( lin and a +9.0-C charge is at x = 4.0 m. Where on the x-axis can a third charge be placed slao5g /v 1pq,6p uomd(o 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 cha :e(6ofj5b ,2cncp f2-otpkag rge -q is placed at x = 2a. Where can a third positive charge +q be placed so that tong,p2bj6a:2 kpf-o (c 5fce the 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 3.0 g. 7abhg 1e5jd-q 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 gravity by the ay:8nn aln 70mgged 5m5ttraction of a fixed proton some distan5a5m8g0nnmen:y7gd l ce above it. 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 are hung from a commonk 2tnzna dd glw.43x9: point by nonconducting threads which are 30 cm long. Both are given identical charges, andk4.nxn29:dgld w3 atz 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 aa0wlu *cuiw-lld((l1v - o4ot charge of +40e. What is the magnitude of the electric field at a distance woluo l4( wvlc-1* iul0(- tdaof 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 direction of the electric field at a distanceqo) )wmvquz2o*k9 4eu of 1.50 m from a 50.0-nC charge9kq*ewuzq2)uvo m o4) ?

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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 ch * ud-c6ib rx(b9jvvm5arge. What is the magnitude of the electric field at the location of the test ch i5u9b-xrv dbv6cm* j(arge?

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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 sma.)l/a0n mm.zhe:c6fu6 vrcnw ll test charge. What is the direction of the el rnv:zlm cn a0h.6/ewu) .cm6fectric 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 magnituv( )-kj.g (9x5dxiws :y* s/bcgvxyscde of the force experienced by a )bg.(vys-xc(x 5*y/ d9kssg cxvw ij:1.0 nC charge placed 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 are separated by a distance of32v5+ut ::z glv7xc lett2j eg 4.0 m. What is the electric field at a point mi:tugxt: vlct+52v z 7jgl32eedway 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 s(m9h0c50il lu*rby7,y gbd) ytlf cw 2tick and a -4.0 mC charge is placed at the 50 cm marku 2h(cli)75*dw rl y9,by mlygc0tf0b. What is the electric field at the 30 cm mark?

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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 mark of a meter stick and ae57 :fvm1 wp8vpu4tvh,6f yzr -4.0 mC charge is placed at the e4v5y7,vhp m6p8w :1 tzufrfv 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 mC are placed a -3h:jj. tu np(w:t+mp+zb hirt x = 0 and x = 0.20 m. What isb(m itr::j.zh3t-+nj +w u hpp the magnitude of the electric 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 the three corners of a square of side 0.50 m. Thep dauk,vx u*7zoi// g/ last corner is occupied by a -3.0 mC charge. Find the electric field at the center of th *vg aki,xpz 7d/u//uoe 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 tkxpv(nb.d w 0:he corners 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 at (0, 1). Whaxpv0 k.nb d(:wt 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 when it is placed i4c5v6b y yqj:qn a uniform electricjqqc64 5yv b:y field. What is the magnitude 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 has a mass 1g9j yq7qme j*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 placed in ano6)s m+)sesmly, sb8isxo,xom)w c(* electric field of 6000 N/C pointing downward. What charge must be plsmo*oe, +sx)8mxw 6) b sysi)c(,smolaced on the ball for it to be suspended?

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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 carries a charge of -2.00 nC ;oyj-ftdjg*q+/4ry fa*32;l aq kpdr. The ball is placed inside a uniformq;f ;p rogdata+ly 3 f*/4j- d*qr2ykj electric field, and is suspended against the force of 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 10 cm carries a charge of +2.cz 2 9*dqxay1tg2y:fd0 mC. What is the magnitude of the electric field 5.0 cm from the sphere's surfacazdtc1 2d92 q:xf ygy*e?

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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.7m a8- bu4hbze What is the electric field 6.0 cm from thea ue-m8b hbz47 center of the sphere?

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