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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 electrin bl93oz +bqj m0,lon/c 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 ea5yylhq. 4k a/ach 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 64+znfpew3m s 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 adu/+7e wzlrg kba,1+ aw8 qm,a piece of silk. During the process the glass rod acquires a positive charge and t+ a+7b1 g,l a mw,edzku8rwa/qhe 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 )iuqo6b,fl966,rc ftskyb u/ 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 haf-b7lm1z 9 bdb7;qw gas

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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. Theqn7 i-wn3 zb0cqcwvd;sz( 7x* 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 theho(zhfn2zyarh9 .10 f nuclei are referred zhrza 9.(h1yo02hf fn 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 nt,k ylno;ju 86uclei and can mov6 ky o,;8tnluje about freely within 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 brought near one end of an uncharged metal bar. l(,xkkf+od5 zaj3 p0f The end of the metal bar farthest from the charged rod will be charge + ld,p0kk(jofx 3zaf5d

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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 posi h +:hb7nxbdp/tive 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.xn:+ bhdb /7hp 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 electrors8jeo-jk 1h0 x 2)ko8nlj a39sk )nukscope 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 positively 4s q6 om fb5u5bh*ilt+charged glass55is4*tbf oqu6+hbm l 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 electroscope is grounded 5p,ybpu+oxr *z4to3n briefly while a positively charged glass rod is held neany*4+u,z5tx oop brp 3r 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 leavesz1e8 3nz*n dppe m;yf8f 4in6v separate. Then a negative object is brought near the ele; n64pvy en8fzf*m81 dizne3pctroscope, 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 5emnv8ur/sq-g 9 dm1fis placed on an insulated table. A neutral metallic ball rolls st m9rn8q5- 1g/vsfdeumraight 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 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 Coulombi a z;o6ry 87)p7-w9 rhbs8elftcpsl: 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 ar:cw o,r hawo l2,n/v+(wji-v se separated by a distance d. The first charge is larger in magnitude t ,,w orslv+aw-oh( vcwni j:2/han 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 is neutral. co p5pu.*s5k sThey are placed near each other on an insulated table. Which statement best describ5us.k*ocsp 5p es 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 othegbqf;lh/0 9ckr with a certain force. If the charges on both objects are doubled with no change in separation, the force between thq b /lhc9fgk;0em

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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 distanahu2 0fa /4tjfce d and exert mutual attractive forces of F on each other. If thtu ff4a 0a/j2he charges 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 x)fk.g kbo21 eforce F. What happens to the force between thex1k g efbk.)2om 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 distanc lcuyx:(i)8e d.mdi8 qvr.wv0e 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 ele qiymv 8lvd)w:8x0e.(. drc uictron?

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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 hagtnm(f-sgmq, k+ 18h r56 sjqh( r2yieppens to the magnitude of the force on the first elecqmrgnq,hthem y+ r6i1 (5 ssg8k-f(j2tron 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 euk1p;2teheh g9 70ri distance of 1.0 m. What happens to tehuegept197;r 2 ik0hhe 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 cent.gn4u 9s e:itl+fdv:nu ,7ftl er of a square. 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 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 poig n d,tlf:.7s4v9t +lef:n uusitive 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 cpubgi 0qg8 vr86v8p v id0+.ydentroid of an equilateral triangle. When a seconddidv. v 8g08yg8rb0+upip v6q 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 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 followingshs2tl)o p y7gjh8 - l1-hugh2 is 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, the/ em d,bu3cr3k 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 .,f0iw4gel:ielk rfefoh ) :/field value between a negative and positive charge)e:lfkle/of. ,i 4g 0i :rfwhe 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 valfukxig* qb-gz* l)s e(b)3rv)ue between two positive charges along the line joining the tr)u*-kxzq) *f v bg3gel)bs( iwo 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 psitive point charges8b8j8hz9x gj 7ko ,ulx

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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++n k77i*) i ekyaibpwhown


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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 i;bgod37o/9xn z 1gt cwntersect 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 nlv/4ew)xgk2 vl2q*zy rr4d5 equilibrium is placed in a uniform electric field. Give a statement / lkgzry)ev24*d5 nrq vw4x2l 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 ezckd p1; uuz.7u/wpqtuu ga-:8,)en lach given the same charge, the electric field (E) midway between the center and the surface n;z p 7 pzau uug8u1l:,/dq.wtue-k)cis

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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 alumin1.+gepjz x x c-makxb ft/.n4mg4k21uum 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 blockexb-.g.xc 4kxju/m4 anm g + t1pz2k1f'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 equilibril ;db0nbr/z71(emp j wum 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 sphere that/ a*t- ;.p;dgf sahafg is grounded. As compared to the case without the hol;-fd ;p.t/ga *hfsagalow sphere, 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,b3kej jcc9w 4 y 6h mj:8k,jro*(ikem 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 electrond2s1 y ,m3qaok 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 m 2m hgjacbe 2tq))-x3gavj+o6any more protons than electrons does this pi2g )+coav6jgbeqj)3hm at -2xece 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 kglaac (: ikl )8hdrwrthkj*2 (3 of 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 ofd+haes)/vk h ek 2,a-j $+40e$. 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 2.0 and -4.0 mC,tfjr92gu90 n)x aa(gr respectively. What is the magnitude of the electric force betweenr9f) t9gagxr n0a(2j u 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 force between them is 1.0 8yxla;* 5v3z d*cumgo+ 4xd bnN. What 8yl bxgozmnvda*4dx3*5 u c+; is 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 ag *nlo w4dgs j7/5dyr0y,qyb2d s r*k0 force between 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 6 v rtc, m8a yywf wfbj5)n-33i9y5sue$30 \; mC$ 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 c;q4ln715sp8jrht w la 1.0-N force. If they are moved to a new separation o jr715cln4h ptsq8wl ;f 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 p) yf2*x d3 lytojvqz(-laced 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 f- dy* (tvxzoj l3y2q)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. A charge of +2.0 mC-9ddemqr 78(yhfa*3qext eo0zr jt6 ( is placed at the origin, -2.0 m C to the right at x = 50 cm079(fh6ardoyj- xdqz8e r t*ete(3 mq, 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 arefekx eiw qchdgm7:dm l47 f961 .zv8w5 located 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.9mx7w8 dhie7m:f6fd wq zgck .4el15v 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 iiikx40ro.5e +; /aj svjjxur)s 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 cexxj)rjvk ia oj0iur;s/e +.45nter. 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 , dr+e s.m3ljay/o:sbm8t*x l ee/wf .(0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of thwsb:. ,fje/8e.maorylxdsm /+3 lt* ee 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, 0.10 m); Q3 = 5.0 nC i8( z9s0 uojriy+djxe+p.-gj1+ohc iv s at (0, 0). What is the direction of the net force on the 5.0 nC ch (ioj+y10rc .9+zh sj8jxvod+g eui- parge?

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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 ar.npa v1e clqt, eh2)q(/q9 vzve placed at the vertices of an equilateral triangle which measures 30 cm on a side. Whec(/hqv9,t.v pqn1 za2ql v)e at 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 p ynag ni6i96 5t1eu1(z/awmv by 3.0 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic fp/ia65zy (i1wegu 6v9a1mnntorce 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 =.;p n-b1:wfao hwi nx+ 4.0 m. Where on the x- +1if-b. nhwoxpn :wa;axis can a third charge be 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 placed at the origin and charge -q is placed at x = 2a. Where cwwa 9uiim,g2*l8 1jw* jec 7gyan a third positive charge +q be placed so ,m a7wc*2e 1iwgwg8*iyj9j lu 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 3.0.8u 7c9ccmcyyj( xla1f 0s4o o 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 gravity by the adl v )j eoz5q oxsj0+k5rea.-3ttraction of a fixed proton eljrdk )o+ sjea x.3v5qo -z05some 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 nonconductingl4d55 s5vz-m2yg p6jci2jx ge threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them a2xdmc gzv5yj 5g-pe6l4i 2s5 jpart 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 thexk9s ) )qjbz+c5vjkx - electric field at a distance of q+k-b )5 csvxjxzj9)k1.0 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 anu+: deokub za7+8pii8d direction of the electric field at a distance of 1.50 m from a 50.0okipie+7z8 +:a d 8buu-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 magnitudcky5k/ b2 wpq0j2h-cle of the electric field at the location of th-cw5jphk bqyl2k02c /e 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 aamq;x u fupr1.lwq117 small test charge. What is the direction of the electric field17 a1.lpu m1qwfx u;qr?

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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 sec k+q0j 5p rm.0d(5rjv /kmqo5namx,mall test charge. What is the magnitude of the force experienced by a 1.0 nC charge placed jnx q,5dm0rvpm k5aqm5o+/(r jc.e k0 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 hah/6xwa-cc bo )n28kcxve a value of 3.0 C and are separated by a distance of 4.0 m. What is the elexhcawc 2 nc)o/-6kbx8 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 plac/mjh4l0x )zsw 6cp x;led 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 electric fs;6x)l0 hjp xlc/ wmz4ield 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 1rlk, n .4abbemark of a meter stick and a -4.0 mC charge b ra lb4n1e.,kis placed at 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 ps ,4cxe7,nnej laced at x = 0 and x = 0.20 m. What is the magnitude of the electric field 74n,neecs j,xat 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 ofn5 n, 6c qe2; ybz kk4 yzck:7dtwm5izu8.nj2y side 0.50 m. The last corner is occupied by a -3.8;mk54 nit7uz zccdqy n:w2yne ,k .yj2kz5 b60 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 p5u- h,8j9u6gk 6vu q pu,wpstylaced 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 magnitude of p85 g96uw6- t u,u qjhsy,uvkpthe 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 mC when b;tthl(.pif6 1pft:fc s5(xt* xdtr7it is placed in a uniform electric field. Whatlr h.1:tct pt ;f6xf*s5t f((xd7pibt 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 l )wvjgp 6li x(+*:gqamC 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 iuv c*6ewet(- ns placed in an electric field of 6000 N/C pointing downward(- e 6c*nevutw. What charge 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 cca91 crpv0g9l-r -w+ ho3or naharge of -2.00 nC. The ball is placed inside a uniform electric field, and is suspended against the force 9rnr-rw g0a-vo+ca1l93pc ho 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;hs-5l t kt itmman89* of +2.0 mC. What is the magnitude of the electric field 5.0 cm from the sphere'9 kn*tt5lstm8a ;h -ims 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.woi t0qvk 7l)fy i q1j0j6kv70-2dfuk0 mC. What is the electric field 6.0 cm from the cenkvl f k26qwo01tydjikif 7uj0qv)0-7ter of the sphere?

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