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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 conswhg *pq dpyv7bp8jh*y9d; r r:rna )00ervation of 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 twd 8c3yh3 0ie7 x len+77jtaddmo negative charges 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 andu :nr; 9ujgo2g 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 siljtppa o5 st(-h, e,k0tk. During the process the glass rod acquires a positive c,st5e0o ph pj(att k-,harge 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 show mt xc(- ce:1.5czykdps 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 hpq9qmk/7- u lsas

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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 protons. The atom ev j5q9g*9icy ed- h-/)-3ysunq awwuis

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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 tighhhev::k ykd1pwzr6 /btm: el*5 t1f+m:t : szltly to the nuclei are referred::: z6rfhht*kme s/ezl+b5yd : pwlk: tmvt11 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 l7 eo7c9ecdcbv)iq1o 2 oosely to the nuclei and can move about freely within the materi 1c q)o oe7279edcbivcal 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 un5aq )-mnhbsts 1/r5 lecharged metal bar. The end of the metal bar farthest from the chargee -5sqsanb/mr tlh5 1)d 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, and sphere B is neutral. They are itp);3,ae w znplaced near each other on an insulated table. Sphere B is briefly touched with a3t,)aznw;i ep 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 rod x0+5m2-unp vo xunn)ucharge 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 positiv.r pm 08.amohtoswk9r.t u8z4ely charged glass rod. The e.m8 makou9os0 .w8 thrr tzp.4lectroscope

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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 briefly while a positizuj es:wi0y,b8b )1 :h 0nytsbvely charged glass rod is held near it. After the glass rod iszb ubiy,hes0 nt:j8 y1bs w0): 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 electro0m .v-- mas iyt2mr19e5hen mix;qs1tscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves1e.rxm;9t-15m 2heavm - 0 ssmnqt yii?

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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 placedgytvcp ,p9h;c 0hnm;9 ;*ff pz 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 0 phypf9m ,*f v9;;gthn;c pzcdoes 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 Coulomb constant br).jvd3 ou5 :tamk+s9 km;gd $k$, 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 49.qe1d qt ,bgejx z3m5i,ki xby a distance d. The first charge is larger in magnitude than the second chargtie ig zj.ek,qq5xx,d b49m31e.

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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 placgwa my*(s 4tm9 jizb;8:* fkrbed near each other on an insulated table. Which statement best describes the 4s rt8:w(ya;bim9m*fjb*gz k 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 :k s2s:la 2tl 2-xi-ohmvs degr, 6cd)each other with a certain force. If the charges on both objects are doubx)l m,rhc-- svd tdk2o :2aligs2e6s:led with 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.uv l ,)rouit; attractive forces of F on each other. If the charges are separated by a distance of d/3, w i,ut volu;r).hat 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 other with a force F. oiftq is4g0z 1,g :0lt0phha* What happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduc*i1 aog zil,q: h4ts fh0p0tg0ed 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 distance of 1.0 m. Whad1*1)ix9 1a v 3nqaqk/xc oxs0 iqh:sat happens to the magnitude of the9av1cik onxq*qss xx0qa)d1/ 1a3i h: 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 a distance of 1.0 m. What happensc,b+;j;ta 1d q)n tggi to the magnitude of the force on the first electron iq jt+iatn;g;, )1gbcdf 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 0.)uddwldd 7a a distance of 1.0 m. What happens to the size of the force on the proton if0. d) ld7dadwu the electron is 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 of a square. dob i208j,wqp 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 the positi obd8p0qjw2, ive 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 equilateral tr-;fyckzb) p7:xbiv t/iangle. 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. What is the magnitude of the force that acts on the center charge due to a b:yz7k/cpt b);i xfv- 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-ogu j0dr)y.dl; 2javb 76hhv 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 pointxv2 s6tc.uj:z5asc -e 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 pm2a 1x1uyfv zv7.7i4cr(p rqfositive charr.vx2m4iu1 77 1(qv rfzycapf ge along 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 b1g *mi2j/ c,f)bteoc5uka* nyetween two positive charges along ,)m t*u 5jife yccon/ka* g1b2the 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 psitiv/h;cvj;kk m y0q a6.pre 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 shu:iyjc w 8c7-down


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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 intermdw dw5n(;g p+sect 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 w *u.-c1vbvj l-ex:u mis placed in a uniform electric field. Give a statement concerning the electr:.lvjv uwu*e-1x c b-mic 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 and a hollow pphjd80rwmyc od c9( .h:i5 2bmetal sphere of equal diameters are each given the same charge, the electric field (E) midway between the center and the surfacidmc:250. pwbdp9 jr ocyh (8he 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 39re cmh xfi:/on a wooden table in a region where a uniform electric field is directefr9/ce:x m3 ihd 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 electb;pncfskbb)m;4h5c 9 7,u 8rdfvl :mcrostatic equilibrium 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 e0elhc;r m z0lf5ah1tlx9)p/ h nclosed in a hollow metallic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a point x5/at )mzl0 ll;fchhhp0 19er 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;fv (hj/ xqrf8 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 m 3sq/(1kmgl pncrs3 e0t e9s9$e = -1.6 \times 10^{-19} \; C$. 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 w)7m9krm e ykdz.ojgkj...;v8ym7gu +2.00 mC. How many more protons than electrons does this piece of plasti. 9 7. .e8yzmvgukwm jgjkd.o7ym);krc 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 protonke p +kpgh67jdxk10 b6):giy 1r7df cnt+2qios?

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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 ch/uspbg lt0) +xarge 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 cha zftg-)m8x.5vyron , rrge values of 2.0 and -4.0 mC, respectively. What is the magnitude of the electric force between ther-,)xv t 5g. z8romnyfm?

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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 rdyotf;c;) zx sis0 +93jv ek.charge, and the force between them is 1.0 N. What is the magnitu+v ic. 3;ex9;fr)jodystskz 0de 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 betw8e d keo4b( -4btvu3ug3kyk7 zeen 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 (vp.y kx5.b m*qgge;a$30 \; mC$ 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 cm8z :uj;k*omuvzongy 3 0p22yp apart, experience a 1.0-N force. If they are moved to a new separation of 8.o: py vzumz8j2yo k2nug*p;300 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 placedaj* *(,ug-s ljk7k riq on the x-axis. The first chargejr lq,g jaius*(k-*k7 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 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 ,y(pa ex;yfi0placed 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. ,pi; f0yxaye( 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 posa f:isog9 55ovkd ).umitions: Q1 = 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.00 mC at x = -1.00faomdo 9v. is5) uk5:g 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 i 2,;nfo8 1j/zn pom3auqofa:ns 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 acts on the positive charge at the centejoq 1on/zn,f mauf2n p8o;:3ar. 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, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.-vuc3:+qz6ya y r q;oo0 nC is at (0, 0). What is th-+q36 y u;aoyv crzqo:e magnitude of the 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 = - 0ghbt7ey9 6ay6 5-1iuzgyhwes wks;( 1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the direction of the net force gyh;aghts kww b0eyy169 iz us(75 -6eon 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 of 3.0 mC are placed at the verfi8b3 ,l0re /ejt+yzm5g j7eltices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts8i+j0ze,g3e7yler 5j/fblt m 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 h8 jfcsbi8. /*y1pgts+4Q, which are separated by 3.0 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q suchtyf*/g8is8j1bsch p . 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 js e b);m7hff.d81vk e+9as3ygn;p bothe x-axis can a third charge be placed s vngyp7oj;)a1 + m3e9.ehb 8kff db;sso 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 charge -q is placed at x wd bxu 53zi .g8oopq0.= 2a. Where can a third positive charge +q be placed so tha5qxb dw8io z ug3o..p0t 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 x*i+:h cmjx/ 1+y 6vmsvkz vu3g. 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 attraction o ( w be;7f:tnc6dab.ekf a fixed proton some distance above it. How f fbe:(c;n we.ta7bdk6 ar 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 z qa(c:h/gjx+hung from a common point by nonconducting threads which are 30 cm long. +acx:g(qh / jzBoth are given 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 + d)2gw-bwe63 b onvc8u40e. What is the magnitude of the electric field atg8wb3o )2wu6nb c-d ve 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 directio8ila8 p/6jz*0jmu 3;odzc nmqn of the electric field at a distance of 1.50 m from a 50.0-nC 3mcznz ;j u6*p88adiqml0 /jo 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 magnitude of tkkm2ns3z (*o jhe electric field at the location of the test c(*mjko3 k 2nszharge?

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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 fr6zep b s2.t7ddom a small test charge. What is the direction of the electric fi 7ze.dsb26 tpdeld?

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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 cha 8jbm-z0 be)mc99,b 4dhzasmv kj8r -srge. What is the magnitude of the fo 4sm8ec 8vmbk0d9jr,m ab) 9zh j--sbzrce experienced 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 3.0 C and are snsu6mf0l6n( g eparated by a distance of 4.0 m. Whasn0ln(m6 gu 6ft 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 mo6a+ n rw7m*odw 2hs2meter stick and a -4.0 mC charge is placed at the 50 cm mark. What is the 2ham *ros6om+ nw7d w2electric 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 /6wl ,-kzntpnmeter stick and a -4.0 mC charge is placed at the 50 cm mark. At what point on a line joining the two charges 6t k/p ,wnnzl-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 plhcej;14 8 voulaced at x = 0 and x = 0.20 m. What is the magnitude of the electric field at the point midway between thch4l ;1ve8jo uem?

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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 corner1dtu8 1q 0wwb,hmc, ars of a square of side 0.50 m. The last corner 8h1 1mwucqtad0r b,w, 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 are placed atzefkt9eo2 er20dy o5+ 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 magnitude of the2dr 5oztfk0yo92+ee e 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)g-9tsks nzs2n 24q 9b x+fqgg.0 mC when it is placed in a uniform electric field. What 24 nbg k92tsx+ nszgq)gq-9fs 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- ol(-(l lxd *e7hwitv has 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 placed in an electric. lt02c6 gmsxa(9,*oujf(vjtb/ kdlr field of 6000 N/C pointing downward. What charge must be placed on the ball for it(atgusf9 (clmv 2ol0/r6d . kjb,j*tx 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 t;i )(iqqw :bjd3/o hznC. The ball is placed insiib q;zq3(/jwih:od )tde a uniform 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 +2.0 mC. What is the magnitu w8noeazy 37fx.(p(ah0g. ez ode of the electric field 5.0 cm from the spzyx g.w .(efz p0hoa7a38noe(here'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 okhw h,0o)l 0e8kti* emC. What is the electric field 6.0 cm from the centewo* e,h)8 oktke00ih lr of the sphere?

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