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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 conservatih)p-s7fe k-mseaonvs m6 s880on 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 negaz8ra )cr1n,,t(htw b /o,kgvbtive 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 anda9g9 2qfsjqt7 4k:ko 7;eooao 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. Durq mm6i4( w qbe3 yd6sqw3r(fe(ing the process the glass rod acquires a positive charge and bwywe(ir3(q 3sm(d6fm6e4qq 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 axgl( beo k yk;v)2:h9-afv7km

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A neutral atom alwayqsmq-i*)q ywn./oq )cs has

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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 ppn+7u-l ekr nzg3s+u1rotons. 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 electrons are bound very tightly to the nuclei are rve:d sis1 )gg5eferred v5sg):is e gd1to 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 govs)1w 86gu , tfdir+electrons are bound very loosely to the nuclei and can move about freely withg frdg)8vwotu+ s 1i6,in the material 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 70.wy2fkam bz ng:e,sbrought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged.wmybe27f zg:a,n0ks 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 spheret;2zx7ibb9noses:ntr:l.v m z2s l05d 1 aj7a B is neutral. They are placed near each other on an insulated table. Sphere xt2 291sbsiar:b:0.j7s;nlzotzdnamv 7 e5 l 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 positive8af8j 4f+ugvy 8jho h4et* e2kly?

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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 cha kbe-fsouy-8*1 ,r8.8(y rdn brxlrwgrged rgfb1yyerxkns,8-* l bd8 8o(r.rw - uglass 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 electr0 ajwux7g ;d8toscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electrosc ;78 jadugx0wtope

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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 eiuin7 k;d 04sw- npa4hlectroscope, and the leaves separate. Then a negiihwn7pan 440;dku-sative 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 ob)+7 swqml86xcs v q1ekject is 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 rolls forward, but does not touch the negative object. At no time w 7ql8vs)+ mkqc61x esdoes 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 consu-ktwui,r8 y ;s; un)wtant $k$, 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 chdhnpjo 39:3 z(d/urluarge is larger in magnitude than the 3(zlj nuoh9rpdd/:u3 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 near6 bya )mdq+u,hemsi-+ f lhr4* each other on an insulated tad+hh fiab,- e6*4u)ryml + smqble. 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 attru61r kfv/*f axact each other with a certain force. If the charges on both objects are doubled with no change in separation, trfku/v *1x6 afhe 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 mu+oxvgo*k5 z0ptj8c ; vtual attractive forces of F on each other. If the charges are separated by a distao0txgkjoz8 +vv*5 ; pcnce 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 force F. What happens t8 vb3+dkf ei15sfz-ebo the force between them if one charge is doubled, the other charge is tripled, and the separation distance betwe- 815 +f3szie bdbvekfen 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 distance of 1.0 m. What hen,w8vl h;az4zw00 ooappens to the magnitude of the force on the proton if a second electron is placed next to the first electrvnez8z h,4aw0 ;l0owoon?

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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 1q,m2s1 rozybuo- 5zk,*wrro 3 .0 m. What happens to the magnitude of the force on the first electron if a second electron is placed next-2b*z5su3or,y ,wk1rqro moz 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 mn939p;bhzpsfxkgfrj(u z.g2hy* 6 2 n. What happens to the size of the force on the proton if the electron is3zn rx bhk2 z(f6ugf*h ny;s9p92pg.j 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 td2b *h;t-x2jdc yv(r jnni77 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 positdnr27( xbhj2n7yjt ; dci*- tvive 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 equilatv.tuk+jrscmh1 q:.(1 *hn qpkeral triangle. When a second charge of +Q is placed at one of the tnksj 1q+vuqr.k hcmpt*. 1:h(riangle'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 is9n6i 8,k/zicjx ,xzkhiin 8 .g not 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 1md5 soen:c v*65fpwl, 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 betweenk h,mo8 +2+d;u rheuyo a negative and positive chud;m+u2 ,+ey8hr ko oharge 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 u-(t6afzunrd6 5 +l mdvalue between two positive charges along the line joining the two char m d(u6lr65+-zfadtnuges?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electric field lines neq :b.mu jd+t8dar psitive 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 shown:ombb b.u+1 zl


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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 in2w d.ce++w,p1zl dyhr 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 iruss/ct;-(y0e bus)**s yepw n a uniform electric field. Give a statement concerning the electri;w *r/sc 0pse*)( suybut-seyc 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 areu zw+ewab vcb1bwuao9+,/9kb90 adp3 each given the same charge, the electric field (E) midway between the center and the surfak9 euc + /v01w, z odbwbpbb3+9a9wuaace 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 ttnqm )t:6rv.;a vh+ il9rgh:mable in a region where a uniform electric fie :9+)rlrvmhm6t;i :tvnqg .h ald 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 n y9h(ge(q mr mtm6i*.electrostatic 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 enclosed in a hollow metallic+k bjzdw /((ua sphere that is grounded. As compared to the case without the hollow su (j(a/wk d+zbphere, the electric 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 stao,it1y t/ 6sft/f3 sya14 ucd.fe:y yd xi-c(vtic 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 x,v /jekr f22awns6e(c4q rq-electron 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. How many m)*m-fi 2t1)stzafd1yusd y, i ore protons than eleim 2udz*d)ys-tf1s1iat ,yf) ctrons 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 otogv6q 2s 1ef 3viwus8ps f.43f 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 si l( 1p7epp:pcharge 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, sep.d/3c 8wd ujdoarated by 1.5 cm, have charge values of 2.0 and -4.0 mC, respectivelyd8od 3ud.cjw /. 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 apxdgg ff (mren/5ym 8- o6 uy-sch,c61 second charge, and the force between them is 1.0 N. What isy-d sc6g 85x,oehr-(fgyumc f16p m n/ the 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 between them of 1.0 N. Howq rd, e:.qw4i;m bufu; 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 lhwy83/kbw.uj7/7v bwb j9uv$30 \; mC$ 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 force. If 80g fbse,;jxi;m rfk1qf-h/gthey are; g- ,fqx/8g0i;efbsk1fhjmr moved 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 mC are plal y.i5 7cy(jppced 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 5pc( i7lyp.yj 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 gx c2v(;8 oond8cf d-rlg 2cm-x-axis. A charge of +2.0 mC is placed at the origin, -2.0 m C to t doc8odx-ng;28lcrmv c -2gf(he 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 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 locay/v6 g5l dzub)ted 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 magnitude of the force on th5dg6b) /yvzul e 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 alt+hhn1 g/my q;/ido *sm: ;cp second point charge of -Q is placed no qc *;m:h/thd+pg;/y si1mlat 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 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 3hr c( ;wzsp4:wg*5kyfi5a cc, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What3 a;5cr*szy:5fi( 4khcg w wpc 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 (0.30 m, 0); Q2 = -1e848s; r stg) b56o: 9j3v afzcsguprr.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is3z9s frs6c:vr sp8bog gj8 4 u5re;)ta 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 mCgs+ w64iaq tc5+;lyd 74 y9y ybtvtv,h are placed at the vertices of an equilateral triangle which measures 30yilw4tv6y dt7;+ay ,vcb+5sq4yt9gh cm on a side. What 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, which are separated by 3.0 m. At what poik :7p,qc;*vwvk wr2vgnt, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force actingw ;,kqc7: k*pvwvrv2g 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 qw8i 8561nd -fwtkqvhy1ta0i x = 4.0 m. Where on the x-axis can a third charge be placed so the net forcewk8d f-q1v n8h65 10aqiy itwt 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 o w;p)t dyn3r;z6 icup7rigin and charge -q is placed at x = 2a. Where can a third positive charge +q be placed so that the force on it is zer3;u) nc;p6iy prw7t dzo?

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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. A total ofg8r qvp2nxuav9pq6( /wvr*(t $4.0 \times 10^{12} \; electrons$ 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 l: 2mys/d 3c6inymh4p force of gravity by the attraction of a fixed proton some distance above it. How far above the electron is the pr/y 4cdpy2 mns6li:h3moton?

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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 spher:r o ce45cx,jycl ,xh fy9,6ezes are hung from a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electr,:x6 r,,cz 5hoc9ejcf4xy y leostatic 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 mw,.* bg0jogacharge of +40e. What is the magnitude of the electric field at a distance of 1.0 m ,mo.bwjag 0*gfrom 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 and5s sz yjix*;.w8huw h) v*qc6d direction of the electric field at a distance of 1.50 x *6ywzsc;h8ijdw* .s5quh v )m from a 50.0-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 x, /: n/8ksthif(;f f(zkv vlhg3c:uf from a small test charge. What is the magnitude of the electric field at the locat v c( nff//(vhlktf,zuix: ;:gs3hk8fion 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 the direction of t 52i(ly (4s.eoehmnevhe eleo54ie emh nsvy.2l((ectric 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 magnitude f(y 28 ;.d enaopt ,jhisqx1)lof the force ey)f1tq;a8(nxoplsij ,2h ed .xperienced 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 separated by a distance of,sbc+0pcvx6zv39 uef 4.0 m. What is the ele0u9cv ,cxs6+b3fzp ev ctric 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 meter stick and a -4.0 o3gqwa w:d++,mh l(zwmC charge isdoq (m zgwlw 3,h:w++a placed at 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 placed at the 0 cm mark of a r2t kbe+q;x*nmeter stick and a -4.0 mC charge is placed at the 50 cm mark. At what point on a line joining the two ;qt erbn+*xk2charges 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 = 0.2guw*m jpy:j yc4-x:c30 m. What is the magnitude of thewu:c cmp 3-yx j*j:4gy 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. T9z na6esta-w1x2 t 1wdq e.v3dhe last corner is occupied by a -3.0 mC charge. Find the electric field at the center of the squar sew9dt6z 3a -n2xw.1v1d teqae.

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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 ap uxs(2l lg1)aedn i.8 side. Charges are placed at the corners of the squar2e1gl.(8ds )a pxui nle 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 ourq8-uj5h ih3 qsuk) 5f 5.0 mC when it is placed in a uniform electric field. What is the magnitude of this elk 5s-8quj)huhi q3ur5 ectric 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(,stpqwc8nh a5w;t: c 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 isizc)vyvus n7 iak5od/00 45ro placed in an electric field of 6000 N/C pointing downward. What c/ 0v)u04k rdc5ioo s z75vayniharge 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 of -2.00 nC.c,5lp6,zy sec The ball is placed inside a uniform electrice,zs yp6 cl,c5 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 o5qv26kbvo6z5o m 2ai bf +2.0 mC. What is the magnitude of thez mb av565ob 2voqi62k 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 razyn3q 6y(:okq dius 2.0 cm carries a charge of 3.0 mC. What is the electric field 6.0 cm from the cento n 36(y:zkyqqer of the sphere?

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