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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 cons3 oa3rdi:(j x se-f g-ncjt44hervation 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 two negative charges to attract each othufmfa)0 dkun)7g1 y) per?

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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 pzd tb 9m*dvh v*0b nhk+-wd3;nositive 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 t9k sfm2kfb83x l()nn;j)xq -km : niukhe process the glass rod acquires a positiv kn (q)u:x83 2xkmffnmjlni); b sk-k9e 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 0(8dmenaqj)w 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 has.ch a uk)zz,(8orlu8b

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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 j7hx+ r *.h:rnkj csq.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 electroeot;zu-b ene2wfh4* .ns are bound very tightly to the nuclei are referr-eehub;e4of* wzn 2.ted 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 the nuclei ul1ld p7 p.*gfand can move about freely within the matergll.dp * pf1u7ial 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 rjzh9* vt6okh, od is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged o6, h9*hzt jvkrod 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 negs+:0e2 ocb.w udzj +butral. They are placed near each other on an insulated table. wcgej0 dbub.o+2zs: + 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 rod charge an electroscope posisx dnl-uu )(2mtively?

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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 positively chargedcfwu:z fl ;7b8 glass rod. The f8w z7b:lucf; 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 grounded briefly while a positl. tuhsp+*,;x iv:o izively charged glass rod is held near+* o x,ip. u:isltzh;v it. After 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 neutral electroscope, and the ls -fbka-h8/*.q6kf lq ktu g+:ylrii5eaves separate. Then a negative object is brought near the electroscope, but does not touch58lu +alib-q:.f-tkk qsk r/*gh6 iyf 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 placed on an insulated table. A neu81b :4f)dqmzd aml1 ml 2ni;yotral 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,) n yl:4qildb o1mda2;zmmf18 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 theq 9 .b7c0h s6s1r:tg.wdnrbzj 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 is larg, xwvhe:sl: yu4 m.2eser in magnitude than the second chas y,veshe:w 2:lmux4 .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 neu;,yd.mej n o* :-rtvhmtral. They are placed near each other on an insulated table. v -mt;e,dyrm*:o n.hj 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 ch m3 q0rmbju.*sarges on both objects are doubled with no change in sep. bmmr* qsj03uaration, 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 mutualz 9 sgvxi6x9i5 attractive forces of F on each other. If the charges are separated by a distance of d/3, what are the new muts zxii 6x59v9gual 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 +l9o nkz q9c14oo-6wth qu5a)p g f9ooother with a force F. What happens to the force between them if one charge is doubled, the other kq9toq a 59o+19pufl-wnc goo z)4oh6 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 ar 19 98zavmg4f(yw:.n ktx5vel x(qr ase separated by a distance of 1.0 m. What happens to txw zt4 ke(q vlxg.y5 :(nv8m99ra1saf he magnitude of 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 sik f6gh5fo rh8 cve+bie29/ 4xeparated by a distance of 1.0 m. What happens to the magn/bfi +gk592oef8 x6 4r hhviceitude 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 a 82t+8c8k cehhksw+5n +nablseparated by a distance of 1.0 m. What happens to the size of the force on the proton if the electron is mk takn2 5aelwnch+sc 8+ 8b+h8oved 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 a1k rn0/rmx dqui9w p:9 square. When a second point charge of -Q is placed at one of the square's corners, it is observed that a kxwpmi1u 0rndr:9/9 qn 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 centroid of an equilateral trian5bpbnnu hregk , m*b:9m(5mr* gle. When a second charge of +Q is p5*begn m m(ubpk: rm59*r,bhn laced 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 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 vecucb8z 5phf)7 jtor?

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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 fiel yht)-kixzx. n1 d*fo3d

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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 el9k1 aqtfz76/,:hfuxw u;ndrbectric field value between a negative and positive charge along the line joining the two c/utzkr;uhwqa,: 1f 79df b nx6harges?

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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 zer t*znpsxd1 4k4o electric field value between two positive charges along the line joining the two chargeszs *k1ndtpx4 4?

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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 poin bb h,en pp5lgf-) ed-xne4s8.t 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 showpi8d (0 1*ag3cimmfkdt 5/eoen


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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 free .z s4i 22ku .2bspzik ,.zymzcspace?

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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 metalxr kzhs16 o-owb4z;s9 in electrostatic equilibrium is placed in a uniform electric field. Give ak-1;4s zo b 9wsrhoxz6 statement concerning 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 and a holl( /15xucv*5eb+gyde(qb b6i w/4ytc gortrq8ow metal sphere of equal diameters are each given the same chwqt 4ybxo/(i56 vbcgugey(er1qbd*t c58+ /rarge, 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 alumilyb: 7hl;,e.mgh g b,bnum rests on a wooden table in a region where a uniform electric field is directed straight upward. What can be said concerning the charge on the block's top: ,yl .,;bebbm hghlg7 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 nv85umc eer7 ic(cw* . .div:jlear 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 hollow exi c8w7m7lu5metallic sphere that is grounded. As compared to the case without the hollow sphere, the elec xcl77muw8ie 5tric field at a 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 conductors in static equirmz6e4yk1o k7 -ayx. llibrium.
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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 i9fmx2 n s 5ntiy+wp5d9, r9hgys $e = -1.6 \times 10^{-19} \; C$. 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+tcot;r km(c8 +2.00 mC. How many more protons than electrons does+;ormc t8k (tc 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 wzap30,) dn pu61wdli 8sl er/knu-4rof 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 charge otot tt0l(- cq9f $+40e$. 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 2.0v5/gb gf e.;cil6f.xn and -4.0 mC, respectively./fcibx6.f;5egvl .n g 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+-kbd;nku h/w charge, and the force between them is 1.0 N. What is thekk+ hbu /-nd;w 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 unyf 5gf sj0*pn e(h 9:v 7zt)vdg.,nmbetween 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 q5 ccs/n684kznzcv.z$30 \; mC$ 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 ydogp6x l o516cm apart, experience a 1.0-N force. If they are moved to a new separation of 8.0 cm, what is the elgp1 ood5yl66xectric 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 gpb* mc8+ bbv: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 1:cm*b bbpv 8+g00 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 placed on the x-axis. novzdw l, ft/fya6e.9s2.u t 3 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 charge tn6u,az 9 eldf2wv/o.fs3 y t.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 th,0r yqnfhx/a gwyl*5b 0z *u7ve following positions: Q1 = 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.00 mC at x = -1.00bu05 xn7q/y yaw*0r*lzv gf, h 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 +Qjcd:c2m r,,sju.q 3ix/c(dvo is 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 center. What is the magnitude of thes vic cjxmqjd3,.drco:(u/,2 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, f3(19l ny+y79f v2uksmiez2 vqx n4kh0.10 m); Q3 = 5.0 nC is at (0, 0). What +9yf 4l1 nz3fi79eumkqkxn yv2hv2 s(is the 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 (0oij o03-m/kfu0a lx;j.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0o lfu mo;x0a/k j-3ji0). What is the direction of the 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 of 3.0 mtl/m8)ivs3 hf)m ;kl k5u v0egC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic forcll v guv5 mk8tm0/3sfhk e))i;e 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. At what l0ib,.ww j+oi c 2n6hgpoint, on a line between the two charges, would it be possible to place a cha2 j,i.6ciwwo bng +0lhrge 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 xvp+7e 4o:wop= 4.0 m. Where on the x-axis can a third charge be placed so the net force o7e p woxv4+:pon 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 ail scy o:kqqpesn)xy4 n;,x/ d9p78c5t the origin and charge -q is placed at x = 2a. Where can a third positive charge +q be placed so that theq9cinnxd 5pk8:xq4ls7p)y ,e co /y;s 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. nvl/ pm , esm/:.yyr0vA 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 agains piqf8i0j p 3z-)xvl(yt the force of gravity by the attraction of a fixed proton some distance above it. How far above the electron is the pri)j0vpy8xl pf(- 3z iqoton?

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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 from6t*fc rt nbi;bw:a7j7 a common point by nonconducting threads which are 30 cm long. Both j ;ca6:bnfti7b7 w rt*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 +40e. What is the magnitudeu m;tm e)p:l f*9rqxw9 of the electric field at a distance of 1.0 m from fxmr :u9*9mwp)qtl;ethe 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 atrd,jji pv86ng(rkrc393 x fe * a distance of 1.50 m from a 50.p3 j gc,6r 8jkf 9nri*(dvx3er0-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 magnitude on+)d8l5ehwc,cwwi1 nas0wf2 f the electric field at the locatio5il,wc2 d+s n nw10fh)w8c aewn 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 smar amv1vqwze :y;*v22n z691xdy. vhkdll test charge. What is the direction of the electric field?d1nm avvz* ye22z v.vh;9r6 yd:qkx1w

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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. Wme;t v)i /apm1hat is the magnitude of the force experienced by a 1.0 nC charge placed at /tvep1 ia);mmthe 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 c2c op:8h7.z3+t zwuhib1bwjand are separated by a distance of 4.0 m. What is the electric field at a point midwajh:7p1 i3 hz2bt +owc.z8 bcwuy 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 stick and a -4.0 mC c b 5rx.fmmnd)e1ssv z,/ pe9i3harge is placed at the 50 cm mark. What is the electric field at the 30 ceds5x s 9p1e)z/f,.3nvm rbmim 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 plac*odan j9 cb7wf mx.(0bed at the 0 cm mark of a meter stick and a -4.0 mC charge is placed bbox 7d 0wc.*mnaf9(jat 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 mC are placed at x = 0 ae.jb7s shw *j*fetk)8 nd x = 0.20 m. What is the magnitude of the electric field at the point midway betweejbs h*e7je8.t* )wkfsn 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 thyy9oyc. ef;,x 5bjz;i60jlzh wu0 rw(ree corners of a square of side 0.50 m. The last corner is occupiede.6rolhyzwx 5c;0jjwbzfy( 9 0 uiy ,; 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 at the coxe a1;5z- y. ovh7pbtgrners 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 the electri.o1b5-y7exp gth;avz c 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 mm-sg4j+ :vs54euxa* aez;: msxj i 3jhC when it is placed in a uniform electric field. What is the magnitude of this electric fiszjxsg 4ehsjjm-v:ixe 5 *a4m3 :a;+ ueld?

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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 jax jp7k82 mygny pgknb88* 1o67goa)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 y3(sh;: egxa38g.kqf 2jtpizis placed in an electric field of 6000 N/C pointing downward. What charge must be placed on the (ph2zg q;x .:aiy kgs83t3 fjeball 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 0.17axt*dbvkw a2cqym97 zinl3t ,m6 +a650 g carries a charge of -2.00 nC. The ball is placed inside a uniform electric field, and is suspended against the forcbamki c2 yn 9x366maz*lqa,tdwv7t +7e 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 cyh) q+n uqo/z1m carries a charge of +2.0 mC. What is the magnitude of the electric fieq zn+yu /ho)1qld 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 is th;-yy(f xibhbtg:.; 7 atia f)ee electric field 6.0 tgbta ;hb ax-iei(. y);7 :yffcm from the center of the sphere?

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