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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 conse g0zf e5l(pjk)rvation 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 tb/av jv,dmhb-, +7wfg t e:6qy3cy :guwo 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 posi j/kbfo*(l/h zdoz65 ptive 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 proceksad4d/4x7koab 6,j sss the glass rod acquires a positive charge4ba76ds jsk 4xo/adk , 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 j dbq zc02l)wfi;dv7.i4 xb3b 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 he ql/.5 j ek;m*tv praedam47.as

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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 protoa q8pg5v:txj-p.e;tjb 6 bc c(ns. 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 electok-f) 8nrxrh1d.eyq.4 u 2gjwrons are bound very tightly to the nuclei are referred to ar geo) .2r4wh8uy-xj. 1fqdnks

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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 and cafvz/zj: ez19q n move about freely within the material are referred to as1jqvze 9/ fzz:

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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 uncharged metal bar. Thehk. ;pjr8id zt4d-y )f end of the metal bar farthest fro8r ;hp fk-yzi4.jd d)tm 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 positi6e ,n*it q0zzm;ri t0xve charge, and 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 statement is c;00, *rzemqxz6ttin iorrect?

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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 aspxmd0-ug,; nkitd:d+d +fg-5a s;i 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 electp uy+0 fqjcln*b7 *nx0roscope is briefly touched with a positively charged glass rod l07py0b*qf un+ncxj *. 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 neutrag6 g6kcim3wu *s /isv:l electroscope is grounded briefly while a positively charged glass rod*csk 6iw6 mvui/3gg :s is held near 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 electroscopx-nkjox3 g.z +*kzyi; e, and the leaves separate. Then akz-k j*;o 3zx+.xgy ni negative object 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 +s: y xwkixt0nr t(.2vis placed 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 rollxt0t (2w.+ x: yiknrvss 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 Coulomb constantt-ly8bfidq)(y31n,1 :qyxf owwjbz sln. 8p: $k$, 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 2eissisk( 68w5)v rw,p7r qfh -o1taslarger in m2vwisq,-1s (wrss ohfkp57re8)tai 6 agnitude than 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 ipedr/4cx5at 3 ookh/d3p d7)ms neutral. They are placed near each other on an insulated table. Which statement best describec/mdx47 opetp k d3o)arh53/d s 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 wi*vwp*3hn evti s f)q xs.u31vx9v)5yqth a certain force. If the charges on both objects are doubled with no change in separation, the fo3)vswphiqe .svy *1vnvfu xx9 )t5*q3rce 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 attractive f 6os5t8 vnp. nxor *+, :d1ymrgshgeu.orces of F on each other. If the charges.r 6nxtg8vodu 1hpssg rm.+, e*n5o:y 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 other with a fog1i2tc r (udqmq+tj+bg/ .1 (c,d dh5cie9gx yrce F. What happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance 1t,bq2cd 1y i tc5+dxrhedg9(q mcg(/j i.+ug 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 dw2we 2xx(lu6 uu4unm1 i)yb2separated 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 to the first elecw6xub2u y(4 weilx1 d)2unm2 utron?

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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 prot morvk(v5a95o c yi e2dluk+9*on are separated by a distance of 1.0 m. What happens to the magnitude2koa 9ed9*rcvuyi( 5+5klvmo 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 distance of 1.0 m. What happens b4yr1ywaijq: v; *f0/p mwaz(fi+ iq4to the y b4fiz+rw /wifvi0;4y:paq j(a1mq *size of the force on the proton if 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. When a second point,)rj.n9 *6 c qfekkymy 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 at the square yj* mfre 6qcn).kk,y9'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 tr7pm3g-oval;lbv:o k) 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 toal 7:l3gbkv mov-)p;o 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 n)n2ix0fov p b-kgpha9 ,s;mhr4cu62rot 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 electriv mwj24+ ejrf.c 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 ze 3k 4sa*tzf32xecn qy4ro electric field value between a negative and positive charge alon33 *xkayt2 zfecq44ns g 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 huk;hiky )dwg87b n.6 fihtzo .9c68kpositive charges along the bthh89c i6 6uk)yih.d z ngkk7;f.ow 8line 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 psitivec z/jyl .t+q+ gp4hm,i 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 s+v4 gzo,igh,, x9kjvg2/ dk vohown


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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 inten-kqzzfz6u h :pr6 42orsect 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 pb dhlu :r*ujoyz5,4+is placed in a uniform electric field. j+:dz4yl5 b u uhpor,* Give a 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 hollow metal sphere of equal diameters are each gi /s lr k4xh z/:z7xgi8kirb1g-ven the same charge, the electric field (E) midway between the center and the surface iklgi:s8k//z1xh7r -xri gzb4s

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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 wo 9t ccz+u 0m:,6kksfxwoden 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 9sztk:c uk6wm 0f,c+xsurface?

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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 chargq+ a5+fsrm :bn3 wfd3qe

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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 metallic sphere that is (eir ;948hq g r1o+fipbnp- t 0vq3lq5zx7tntgrounded. As compared to the case without the hollow sphere, the electric field at a point directly above ti 7xto p0-et5n t in+p8rh(qf3q9gvlb14; rzqhe 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 eg1yzn2c: 4znv)7wytz kp f 5t2quilibrium.
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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 ele5jj5-pkh4wq h ctron 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 charge of +2.00 mC. Hog8:c6bj+ub jqz*)nw7ybvgpki8 s*cy q+.k5 r w many more protons than electrons does this piece of plastic jjz+*:c7qb.8v up56+gk* )nkwq ygybsrc b8 ihave?

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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 ofoa;tv d*je6 p)rq5om + 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 chja -/j*l pgxy3arge 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 o)l96qy 6(jyt 6 r e0rzouux/o2.0 and -4.0 mC, respectively.(/6x6ly6 yu0j9)ezq rooturo 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 m402hp2q; cisxbr xz/force between them is 1.0 N. What is the magnitude of /q042sz;hx rb xp2mic 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 between t2k16 0-wacvjr dk w7ibhem 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 z/ve2x0b e.rg $30 \; mC$ 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 fobziezu*j e ) o3,h6/werce. If they are moved to a new separationz,zh i6 )jwe/oeb*u3e 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 2jdf sldla4 7 d8tz3t -6(fdbl2.0 mC 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 force which acts on the c2t-4bl6ddf73(lltfa dd 8 z sjharge 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 is placed atiqu +4r.h(v fl 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 cl+ v hqru(f4.iharge 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 positions: Qbfw +r9m6sqq/ 1 = 2.00 mC at x = 1.00 m;/w9 6rsmq+fq b Q2 = 3.00 mC at x = 0; Q3 = -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 ofj,2j3 s +ja3; ksducuc 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 actu sd j2k;sau3,cjj3c+ s 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 = 5c9ym(h mb +)c8i:qtq p.0 nC is at (0, 0). What iic( +h9cqyt:mq)b m8 ps 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 (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.b6aq-s ybsr- 910 m); Q3 = 5.0 nC is at (0, 0). What is the direction of the net force on the 5.0bssr96-by -qa 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 vertices of an/36qdg3n z net equilateral triangle which measures 30 cm on a side. What is tn ez3qg6/td n3he 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, which are separated by 3.0 m. At what poihe +g*yv* zlk82kv 0nea( qp*ynt, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic fy *zgk8 hyvvkne *pe 2+lq*0(aorce 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 =(v nhs5q ah76i/ uzhv8 4.0 m. Where on the x-axis can a third charge b8a6sh5uz7 hv(vn/i q he placed so 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 placedmuvx gqmb,g/c5 st67h h2*tc1 at the origin and charge -q is placed at x = 2a. Where can a third p/q smm* cg1 v6t2x b57cu,thhgositive charge +q 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 i8rnni7xs5xi 4)6 ng omass of 3.0 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 hbqp vp x7t,7vf1 :1ltgravity by the attraction of a fixed proton sqx,71pf v7hltb1 tv:pome distance 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 common point by noncondujg bor-eu*9xi :h-q( 5e8j lo)mh1amncting threads which are 30 cm long. Both are given identical charges, and tg9oh*jnl8 -u5(qx:rmoe-majieb ) h1he 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 thefsz dz )62*qdvowfo/ 4jn q1u6 electric field at a)ou46od fjfqvz s1dz2/qn 6w* 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 direction of the elecu idzc0m8zhq( /q.f 9ptric field at a distance of 1.50 m from a 50.0-qfi zd8/p.h0 czu9q (mnC 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 fro* /k.9l-pu cctl*rptom a small test charge. What is the magnitude of the electric 9otuktlc/rl -*.* ppc field 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 frw93m3 6;z0 fkpab5w lw4swci oom a small test charge. What is the direction of the electri4p39oaws;c6w0f lmbkww 5 3 zic 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 chb4j goum5. ddkm4v)j s vwgc)4.4/xjqarge. What is the magnitude of the force experienced by a 1.0 nC charge pd m4o4bs)4.mjku)cv4vq/j gd x gj w5.laced 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 separate.tms-,dm bp5l d by a distance of 4.0 m. What is pmlmbts.5- d, 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 p33dr bsusn6: f t.8:mlmj-daa8:rtmjlaced at the 0 cm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. What is the elej:tsls3 nt 8 .m:rumfj mba-rda38: 6dctric 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 7m tfojm0 eyf6mh+ /o-at the 0 cm mark of a meter stick and a -4.0 mC charge is placed at the mo6 7o jy t-m0+/emfhf50 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 xt 044 tq 6 qghqe5at,kezf.x0s = 0 and x = 0.20 m. What is the magnitude of the electric f6e .zgt4qtt, e0qx4sf 0akh5 qield 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 o27vjzu:w 3 xmgqwqk l-:p 82ozf side 0.50 m. The last corner is occupied by a -3.0 mC charge. Find the electric field at the celqq3p2jk 7oux-zwg :: v8 2mwznter 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 sidex utb93ur2zpt*tb;p 4 . Charges are placed at the corners of the squrt93;2 z xt*uub p4bptare 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 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 c+ko f:b yl95m oub6weq74yp7mC when it is placed in a uniform electric field. What is u:65ey7l obcq79oymbw k4 f +pthe 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 onqf5s bkf;k2) c-tef ;f $5.0 \times 10^{-3} \; kg$. 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 0.120a lcmzjkz9 /0-q/t; mz g is placed in an electric field of 6000 N/C pointing downward. What c/q- 0m/kjz;m9zacz tl harge must be placed 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 qymq6h99mqn 7zsq 7i+of -2.00 nC. The ball is placed inside a uniform electric field, and is suspended against the force o9+q7h6 mq s7 zyimn9qqf 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. hg*,jtg34qk zWhat is the magnitude of the electric fihq *4g kj3t,zgeld 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 rad eex r/2t;+lgjius 2.0 cm carries a charge of 3.0 mC. What is the electric field 6.0 cm from the cent+;gejtl /r x2eer of the sphere?

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