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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 of electric chk- g9-uay+; k6ut.umk1*/ zbgtrppij arge.
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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 attract each otjxbh27e,)npj hib1 r x4ngpr) (hg(i(her?

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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 posiy-pxe: .rnfvd8 co+v )tive and a negative charge to attract each 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 process the glass rod a c4cu 26nyxe+acquires a2c6e y uxca+n4 positive charge 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 atom shows at.zd 2f fn,w /vr0z)po

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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 r 3/gnu64 wmypqq3,pb+5sn1 vbmvb s1has

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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 electront j8e-pl ++0n ijlyml9s 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 eleq- -drry0 jsl2lh+b6 cctrons are bound very tightly to the nuclei are referred to ld+qhj byl6crs0 --r2as

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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 bo q+(y*tnbfrr(und very loosely to the nuclei and can move about freely within the materiyrtf +bqn*r ((al are referred 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 end of an(brd2c eg/ji.jq )0h v uncharged metal bar. The end of the metal bar farthest from the charged rod will be cha0 gjcj(hbivde ./)r q2rged

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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, a)(kvy 6 pylrj :+mrw7 ,zo+m9;ablqq and sphere B is neutral. They are placed near each ot) m qwyrk;abqm l9a6(jo7 r+y +p:,lzvher on an insulated table. Sphere B is briefly touched 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 negatively charged ro;rn.fi cebe .cz zz-m) ,+hpc)d 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 electroscope47iv o t we6ah5uub027x)gut w is briefly touched with a positively charged glass rode7ibux0 owtu5g4h )7 6a2wu vt. 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 electroscope is groundesl+-xo ,gsawfj9 9 ci:d briefly while a positively charged glass rod is held near it. After the gxsl9s cjowf 9i+ag- ,:lass 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 neutral electroscope, and the h ge.i.unz70n4ik ,h/q (mm gm,l5xqb leaves separate. Then a negative object is brought near the electroscope, but does not touch it4 nq75.h /ighx (e,.mkmlmbu0 nzgiq,. 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 1bggu.sr5*+ ;qlcofgb , bbn5is placed on an insulated table. A neutral metallic ball rolls straight toward the object, but stops before it touches it. A sec1ubfbg b 5l ng+bq gor*.,;cs5ond neutral metallic ball rolls along the path followed by the first ball, strikes the first ball, 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 Coulolcz4tsl1;q,wny9kw1 wsloxz b6 b/-7mb 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 j;g 3b(54 9 dkaktortta distance d. The first charge is larger in magnitude than the second chak5 4j3k tdbgtrta9 o;(rge.

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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. Theyzbvu7g 2e-ws0 *dj9is are placed near each other on asv u0wjieb2dsg7z9 - *n insulated 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 force. If the charge;7k .y1 ( 7q :jwhl7rogly em*kumz+hts on both objects are doubled with no change in sepaymh( t1me7kg .lq7 k:wrlo+ 7u*hzj ;yration, 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 separate tzo+uk9*e +p(nz (so3r:izy hd by a distance d and exert mutual attractive forces of F on each other. If the ch +kzzuno(r+zph i:y es t(9o*3arges are separated by a distance of 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 oth pao+lvl9;twfv/kn w uez:5 35er with a force F. What happens to the forcpvv9uewl55zlw 3; a:ntk+o f /e between them if one charge is doubled, the other 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 proton are separated by a distanug9ry.mj-g 25wdm3k km 9(lcece of 1.0 m. What happens to the magnitude o-rmld23e k9uky m95(w. gcm jgf the force on 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 a9s y,5v3u/hbltmkxhtjc vd(v v,o 43- distance of 1.0 m. What happens to the magnitude of the force on the first electron if a secotc vhv,h /sk(v3 x, tvbj4l35yudm9o-nd 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 distance of 1.34+,okp 51pqct xvy 5fr 0xbcmb6j7ub 0 m. What happens to the size of the force on the proton if the electron iskc jxxtb,4r0o51+m3p65vub byp 7fcq moved 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(g8roo3h a (zp of a square. When a second point charge of -Q i(h8ogaz p3or (s placed at one of the square's corners, it is observed that an electrostatic force of 2.0 N acts on the 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 centrot+djyg d/ufuti6k 0 v12, k,ddid of an equilateral triangle. When a second charge of +Q is placed at one of the triangle's vertices, an electrostatic force of 4.0 N acts on it.d j,y uf dd/t+v 0u62,t1kidkg 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 nn/0ce*vm emlcko..v9w yo +-iot a vector?

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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 strength of the electric fns).5k.al, y j1gq3 1fzstzx/rtp hj:ield

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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 positib:4iprnvh5:ya2b,td s u kgg3p6e/+yve charge alo yang tpkg 2bpsi3r:u+e4,6y d 5v:/hbng the 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 ha78oemmtjcz, (ys 4 )positive charges along the line joining the t 87 o,atmjscy z4em)(hwo 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 ps fn0j2 ohlj 3a2-j2k4afw6muaitive point charges

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field showk*,e5rjg-9 u6d fgqun n


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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 intersect in freumxj-z e9r+24nugvx -e 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 equilibri,p767i hz cr w6jql2pq4yatyiw ba52l+dm0x5um is placed in a uniform electric field. Give a statement concerning the electric field in the blocpw5y6iiq7qd+mwba6 4r75jly ct p 2,zh0ax2lk'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 and a hollow metal sphere of equal diamh76svc /gna 8meters are each given the same charge, the electrca/8 n6gvsh m7ic 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 aluminumswz6svk/ q l8m q+;4vt rests on a wooden table in a region where a uniform elecvq; q846wl kzvst/m+ stric field is directed straight upward. What can be 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 equilibrm2he72l8 w wvv,dah8p ium near an electric 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 hl.8in irs;n8czp *yj-ollow metallic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a point directly abov lis *-p nj;88cr.nzyie 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 o kff)e:u:1edx f conductors 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 is etjoxc dg6- 3+3wbqq 4$e = -1.6 \times 10^{-19} \; C$. 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 pro()0 dcjdd 3rm)dk *qkctons than electronsckkdc)djd*3m d()r 0q does this piece 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 kg of proxd9 cjn9gc+r( tons?

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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(u6 zg9esmbgph35-hw9 r9i obxl,ce/ 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, separated by 1.5 cm, have charge valucqdi: tsoh )04xt8y +res of 2.0 and -4.0 mC, respectively. What is the mag0chidrq +y 8t4s o)tx:nitude 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 charr5djq+3z ws1beg;0 wbhb fag;jn34* xge, and the force between them is 1.0 N. What is zgw*gqbn fe+ajrj53 ;x shw;13 4b db0the magnitude of the 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 betwwb1l4u;c 1ctfeen 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 b(grasu8rmw * z d6*7x$30 \; mC$ 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, experience a 1.0-N forcl(0:i )tzjcp qe. If they are movedpljz cqt):( 0i to a new separation 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 m /jrukd4m6,u6 +t-hdf+l :fm0a tygrrC are placed 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 and direction of the electrostatic foudtr6fu,y0+-rjf rgd lt a6mkm4:+h/ rce 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 dte ,+8 +ffwur 2lymtv,s7ahx ib)7t2on 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 marktmhe u+fr2lb,t,+ad)f y 2 7 iw7tx8sv. What are the magnitude and direction 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 the following posiwje0/q; hvl 6ttions: Q1 = 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q h/;60ejqtwv l3 = -5.00 mC at 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 placed at the center of a square, and a second point cu4nhclr : rev 4276gbmi7r kq)harge 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 thecr g :2rrbqk euv l764him7)4n 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, 0); Q2 = -1.0 nC is at (0lw.f:li2kin1u x )1/urac:ox , 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of the netknxlf.1 olwui 1:a2iux) /rc: 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);xvg5or)qboy(iw9 q8keq * 2)-radq) j Q3 = 5.0 nC is at (0, 0). What is the direction of the net force on the 5.0 nC coq))58 kw y-9)j doqxbrg*i2(ev rq qaharge?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three identical charges of 3.0 mC are placed at the vertices of anz43 zmha+t )gwts4o9l(8e cx a equilateral triangle which measures 30 cm on a side. What is the magnitude of the ele(a84xzo3cgs w4zet+9tlm ha)ctrostatic 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, which are separated by 3xph85odg hx4kg4 z5 r1.0 m. At what point, on a line betweeng 5khpxo g8 1x54hdz4r 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 a +9.0-C charge is at x = 4.0 m. Where on 1e 3c/t ug)tx.qn pza2the x-axis can a third charge be placed so the net f1)g cet p/ant 2q.xuz3orce 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 charge -q is placed at x 2:*0eaq76b3eobws;hl( 8yh nj9wfh. ljssob= 2a. Where can a third positive charge +* h sqbjhhwl(8bl n 7b:0ewsfj2os;3y 6.ao9eq be placed so that 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. u* lff p,asf7,8tun: ir0o; ,k x9apmb 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 attrnn :ge8c(sx.jf)s8h q0mpyb,/ohz*laction of a fixed proton some distance above it. How far above the electron ic)smjsz l/nxh80gyo.*p :ef8qbnh,( s 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 sphere/g/ gdqr n2kd)s are hung from a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsionkd )d/ qn2g/gr 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 elec/rhd7lxg- 8ew tric field at a distance of 1.0 e7rdx - wglh/8m 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 electrii f+ib7o8ticdku(:u0 gz0k9s c field at a distance of 1.50 m from a 50.0-nC chargcki:dtk z8i ib9 gs0f07u +ou(e?

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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-+a og ;sd.ayc small test charge. What is the magnitude of the electric field-oay. +csg;ad at the location of the test 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 charge. What is thi* ;u) sv a9,uezrhl71til j6:y 9b5gd b*urpqe direction of the electricv * 9atrjr:pze6,ylh9 5b) gulq7bs ;idu*u1i 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 tee*j9 (yv7 hidsst charge. What is the magnitude of the force experieyh vs7die*j 9(nced by a 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 3ejrx3vui/w3xw /00u+ widls 3 .0 C and are separated by a distance of 4.0 m. What is the electric field at a poinx /dw3i+33wew0lvj/sxi0u r ut 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 0g m5( eup4emvd; s-bm: cm mark of a meter stick and a -4.0 mC charge is placed atm54-e;m (pmv ug:sbed the 50 cm mark. 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 place/+h9yzr0vmf+u 5*gmjy:r w led at the 0 cm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. At what point on a line joining the two jvm5/f*+gr0 9um leyrzwh+y :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 at x = 0 and x = 0.20 m.ppk kv+d7/wam, )w9i8rj0rij*4ns z m What is the kis+rvp7r *mn w, )0p awkj jizdm94/8magnitude 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 .o:d: ln l+dhmof a square of side 0.50 m. The last corner n .:omll+ ddh:is occupied by a -3.0 mC charge. Find 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 aremc.*5gxi)hpjn ycun/ t.x, i- placed at the 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). What is the magp*m n5ntc jiuhi.g)/x, yx.-cnitude 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./eb g mg5tv84d0 mC when it is placed in a uniform electric field. What is the magnitude of this electric fie4vgeg5m8b t d/ld?

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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 /a n ns1-vqxt nq(-*rohas 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 r 7b/b*gtgop a7r4q tvo(0/v g,suvy3;c- efp.120 g is placed in an electric field of 6000 N/C pointing downward. What charge must be placed on the ball for it vg7spq b*t30b4 rv /top,gf7uea(g-rocv;/ y 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 carrt0y+2a7 czhp8t/ hlfnies a charge of -2.00 nC. The ball is placed inside a uniform electric field, an fl+2hapz y0tc h87n/td 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 aa ,lnsz4 l;0q/pd2w by charge of +2.0 mC. What is the magnitudeal2ypw;d / lz0nqs4b, of the electric field 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 rad5nvhe f/m.h bqnqb3:v 5qv)6zp80 chpius 2.0 cm carries a charge of 3.0 mC. What is the electric vph n.q m5h05)/vvqqbc6ben3zhp f :8field 6.0 cm from the center of the sphere?

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