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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 conservati k3e,,nr1xk kv b/gjv)on 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 :6zfb1*cwkb u; ov j;vcharges 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 and a negative charge to attrz17ggm 9) lhdo7, adjvact 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 proinaleeg-ovgx(+7(v qu *i (u+cess the glass rod acquires a positive charge and the eai -+ u 7lgqug+((nvvx(e*io 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 shosc bf8bd;8 d8cm,8uolws 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 alwayhp1ha9 ev7wq- wmd-5 y7vp *gpyb5 qj,s 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 protons.- . 0cbl r1z30fe:ylk txqpn/u 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 ef:ezylobcabaqr)g uq)- r-t 3*h 27v-lectrons are bound very tightly to the nuclei are referred to a*y:o72hbrca e-lqut ab )q3 zrvf)g--s

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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 el7(md+t 3qzwp lectrons are bound very loosely to the nuclei and can move about freely wit +3dz(wt7qmlp hin 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 me;y5+y6wkbyp ctal bar. The end of the metal bar farthestyp6y+c bkw5 y; from 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 positivee p+ap5mklt6b 7bz8r( charge, and sphere B is neutral. They are placed near each other on an insulated table.7m(pbe 6a8+rlbz5 tpk 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 positively?ris :4*9s bvof; bjxf7

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An originally neutral electr1edxq sw9m/2 goscope is briefly touched with a positively charged glass rod. g9dx1ew 2s/mq 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 brgdts6nuq,b;a*rh vn 5.r0a ;hnv j4j7iefly while a positively charged glass rods .aujjqrh gv hnrtn6;b,;*7danv5 40 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 electroscope, and the leaves sepb ko;b5/vk wod1hbcz .a(y/2 larate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leave kbw/c1 ah/.z2ldooyv b5(b;ks?

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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 l em6 3eln:xx 26hi*ahan 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, but6eim*3la 26hh lx:exn 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 Coulom ekn(fjq,89;syd z 2vlb 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 bmb4xgda51f)*iet dhz)(dpf ,y a distance d. The first charge is larger in magnitude than the second chhfe*d zi4,)m1dbxap )t g(5fdarge.

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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 neutra4jv ,99 kkn5kdrlh2 b.uxnml1 l. They are placed near each other on an insulated tuljbrx kn5h9nk12 l 9,.vd4kmable. 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 oth4 bnr2hdu 18atccvc3:er with a certain force. If the charges on both objects2va3b d c81u :nh4rctc are doubled 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 attray1mh6 aacm ,e7ctive forces of F on each other. If the charges are separated by a distance of d/3, what are the a c aeh,mym617new 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. Wh t0n5 ,bpe+odnat happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduced to o no+te0bdnp ,5ne-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 distanx o5*nbf8:e icflu 1cts8v u0yj01.hnce of 1.0 m. What happens to the:*u hinc y50 0uo8sc1vetnl.8 f1xfbj 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 separated by a distance of 1.0 m. Wha5ymlmq*ay t 9)tch+k, t happens to the magnitude of the fytt,h*q)ymlcm 9 a+k5orce 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 dist4i *uu,vq7agmance of 1.0 m. What happens to the size of thegmi*u,v q7a 4u 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 thes ki.u;;nqtz, center 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 qs, zt.ni;uk;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 triangle. Whg wanyn-4u /:r/jw zij7sm2f (en 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 tsj2 4ruzyj/ f :a7n-mnw(wig/he 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 nott(dyg3x zsq8jfv 8 2-g 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 distancmx rxw-v)dj ,g +, zjjksj9m*3y0hf9be from a point 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 posi j8zj(zn7sb83ujmi f7 tive charge along the line joining the two f8mu 73(78ibsnjzjj z 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 v+lth0 a;d8lxqrj 4y5rc,-+ztdh( lo3yu0k fqalue between two positive charges along the line joining the tw;zhxur (yj+- o ahqd04k,lcyr8lq0ftl3d5+to 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 chargesb6f4,qkybz+ 2yz)gfy

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field showkvcnqsu2i n9 np+y1y; q93if1n


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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 interses0c ua/mn qa77ct 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 is placed in a uti:+.thtks;1e jxs :wpow96 wniform electric field. Give a statement concerning the electric field in the bl.s;1i6h t+tw:os :jweptx 9kwock'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 maaw10td- vf9are each given the same charge, the electric fiewa9t-vf1 a0mdld (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 aluminum rests on a*z,j5bj:9frp f)bt7danh2 aw wooden table in a region where a uniform electric field is directed stfn)jrw2h azf,bjd:5p9b 7*atraight 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 electrostatic equilibrium near an electric cf4d(8 2cd7xx /kusae/vfqkt+8tr9 cj harge

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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 enclc :dvatat ;n3.osed in a hollow metallic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a point directly above the hollowa3;:adct n .tv 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 equilibri61 r,64 l+tq7tt,m*icj taqh y cblx-wum.
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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;ry ie3ie6 n3j $e = -1.6 \times 10^{-19} \; C$. 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 chargebe6,.uhgi;c yb:, 5 h.k kjc*ftsg6da of +2.00 mC. How many more protons than electrons does this piece ds6jetc u.*khkf ac,gyb b:;h5 ig.,6of 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 o/d gc4 65qvlh*1(j4sjjx wmyin 1 kg 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 s y0wgj(ba7e) a charge 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 ccgz2t-zg12m cm, have charge values of 2.0 and -4.0 mC, respectively. What is the 1 tc2z-m2zgcgmagnitude 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 f/ )pi8qjw6o worom a second charge, and the force between them is 1.0 N. What is the owqo8i jw/)6pmagnitude 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 )k3gz5av/reo . 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 hwa/ m ai*l,e*$30 \; mC$ 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.zm2mm 8 gnf:a2ew 4z.i0-N force. If they are move2miz8fz 2 mgmwe.:4a nd 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 kv7efm2 s.xhcm/ 92vvye;:gd h9jjl 2charges of 2.0 mC are placed on the x-axis. The first charge is at the origin, the second to the right at x mjv2 vc:.hex/ehv 9yf229jl d ;7msg k= 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 placed on the x-axis. A charge of +2.0p2wxgss6 b4j5 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 electrost26bx s 5wsp4jgatic 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 positions: Q1 = 2.2zroq. izrm(rv*b5oi 01c1k n00 mC at x = 1.00 m; Q2 =v2 q( m1roc kizo*r5z b1n0i.r 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 ofb:.gl3o -mei; o ypk;)dwbxm+ h.j2s y 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 acts on the center charge if a third coylmkj s.pb.)b -+ 3oi;eh:gmdy2 ; xwharge 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 1 a4h t;0rt wsi)p7*n-yt)wzogdu dl(is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). Whuh)47w-sa;tz )pog (wtnr did*lt1 0 yat 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 = -1.0 nC is at (0 b,c8(fk3 7 j5uqyavdx, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the direction of the net for3(5d,qu bajxk7 cy8 vfce 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 mC are placed at the vertn:):s;x z0q t;+hev ne4ovv pzices of an equilateral triangle which measures 30 cm on a side. What is the magnitudqhpzvv 4:0;e ntoe) szx:v;+ne 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. Aty8 cjb6;4xrp y what point, on a line between the two charges, would it be possible to place a cj4;y8r px 6bycharge 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 kb4ei+m2v*hv and a +9.0-C charge is at x = 4.0 m. Where on thv bei*mv+h2k4 e x-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 thzilrj1wj *.p12ak 56mgbi;n r e origin and charge -q is placed at x = 2a. Where can a third positive charge +q be placed g.p 115in;jj mlrbawr2i k*z6so 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 3.0zqow dt/n:j d s)a+;tme/z;. q 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 agaic/zp9p)zn1fg t3rtj* nst the force of gravity by the attraction of a fixed proton some distance above it. How far above thezg/ nt p3 ftzp)*jcr91 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 nonconduc0w6s7 a0l*g 8icjj 6qg ooyie5ting threads which are 30 cm long. Both are given identical charges, and the electrost7icgl0s 6 oy5a oj6ige0jwq*8 atic 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 ma e *q i:+8b7:b 5kk2uptomrlyfgnitude of the electric field at a distance of :lbkk*f b25 :p o78teu qirm+y1.0 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 elecs1j r4in ms8hbo5.jb 4dk- l4ptric field at a distance of 1.50 m from a 50.0-nC charge?hb4i4pbnjrk18d5o ss j-m 4 .l

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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 1w qrh 68wcndr1 53x6l5riejk is the magnitude of the electric field at the location of the test chr n15 k i8w6qrhewx13l cd5jr6arge?

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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 bh7drzuiufp:;s 90x; test charge. What is the direction of the electric fi ph:9f irsx; ;0z7budueld?

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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. *cfrp* 33f hnzx)x09tpg( vds What is the magnitude of the force experienced by a 1.0 nC charge placed at the location ofd*3)v9(rnpfcxx*z 0 f gthp3s 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 z(//ae7l. 2 lfu gugyi7o nmh-separated by a distance of 4.0 m. What is th/ /gm lf 2a 7gzuey.-(7iolnhue 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 meter stick and as*g;3; zudaqk -4.0 mC charge is placed at the 50 cm mark. What is thek;sazd3q* g;u 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 ,l, x :s3h/t jhv)memxog 2z59xrxo6a mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. At what point on a line joining the two charges ix z5 3e)mrvhxsjl2aogxo,h9 , xm:6 /ts 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 2lz:eo j803pvyl+ li land x = 0.20 m. What is the magnitude of the electric field at ezl8:3 jp o2lv0 +lyilthe 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 sd egq3z90el 4r5s0,gd nxzz3qide 0.50 m. The last corner is occupied by a er 9z,qs qg lg3zd e040z5x3nd-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.rjfht 228 yvrbu0b n-tf;cueg:5hi,8 0 m on a side. Charges are placed 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). :c5 tjb0- u28,r rhh2f b8 vtenfu;yig 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 mC when it is placed i; 3z qoq ;.acm+*lrf4u ztiidr7u( 6gat9g+wdn a uniform electric field. What is the magnitude of this electric c i a3 fu amzqzd(o;;.*qg+g+itlt7 u964rrdwfield?

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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 chawa.j8r)px*6 g n -excorge of 4.0 mC 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 is8vuub ork-txrtk3206a f+z o 5 placed in an electric field of 6000 N/C pointing downward. What charge must58tf0urokbaut r -6okx2z+ v 3 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 nC4* ,+ rhqwnmgj. The ball is placed inside a uniform electric field, and is suspended against w4nm+ rg*q, hjthe 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 +u tur/x8uvtlg8 l1 b+.2.0 mC. What is the magnitudx lb1+ u8 tu8rltgu./ve of the 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 radius 2.0 cm carries a charge of 3.0 mC. What is the equtbme(quv (je0;r1mj / dh22y icx( 6lectric field 6.0 cm from the center o6x1u(ehetv0 mcdu2;b/(yr qjj ( iq 2mf the sphere?

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总分:82分 及格:49.2分 时间:不限时
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