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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 ele )bnnw+g9jj436twle n fv8t0vctric 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 chargek2 rwj a.f2w7fs 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 qd )yai:5rye /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 process the g/r3 avy 7;+mo6x *wwvw8yfl2w/b0yu yfuk0fi lass rod acquires a positive+ yufw8a0/*iy k/3bmuf ;r6 w20ylv7wowf yxv 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 showscq,4 x7fuh jf9 ao8l vfu )ufmc2j-(l2*odp/s 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 hasrq --.dpyv . wmsw+;xi6vf4fd

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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 elecpc ilccy 0qc42 rz 0c:sq9/p0ztrons 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 eljrm n rz+pd2p931s.oeectrons are bound very tightly to the nuclei are referred tzjo29rr 1+nsepdm 3 p.o 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 vlcfmh6 f856yy ery loosely to the nuclei and can movm6f5hl yf86yc e 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/ty4ttmeq*7 ps dfl+) l:vyr0 brought near one end of an uncharged metal bar. The end of the metal bar fartt0m7q4/+t: ryed s*ftylv) lp hest 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 positive charge, and sphere B is neutramnhyl wz*0q.:ovv g,*l. They are placed near each other on an insulated table. Sphere B is briefly touh*0mn,z:v w. ov *ygqlched 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 2d,u6fe ,esebr6i5 rbelectroscope 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 ch s6jjd/lirb41arged glass rod. The/bd4i6rs1l jj 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 electrosc4tl.dzn0o*;al mo4xel 5. b01en zhxcope is grounded briefly while a positively charged glass rod is held near it. After the0co .obxm0 nx;4 5 lzn4*l1h.etlze da 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 separate. Thenhz 2,h-laeg5j/ee+dq a negative object q +ee/,25lz-hdhgjae 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 is placed on an insulatedl0ca c ) -aa-llbl6,rd 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 rc d-lala0lc6a)lb-, 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 oz7ap/1 yn0skyu *v)sconstant $k$, 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 charcddo(gehdc4z+rnx(*lab 8h:m 8beil 682x ) o ge is larger in magnitude than the secoxbdob6 o (d88nier4+h lgcmel8xcd*)2 a:zh(nd 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 arepu8o aqj29q:*9irz ra placed near each other on an insulated table. Which statement iqqa:a9 89rruo* z2j pbest 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 charges onx-of uswmspk;6ps0 61balx :0 both objecuao0 ;pwlbxsxs6m 1s6-:0fk pts 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 attractive forces of xy)3yr zgrm9.F on each other. If the charges are separatz9r3) . yyrxmged 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 force F. What happens to the forc(6yivzp.-yx f1jvp 1c-skjms, -ks6ve between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduced p(v yp1. s jmxjk-ss 1-yk6,6ic-zvvfto 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 di/a e:/m9 jdbvv /zr6r(ncube 0stance 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 elec 6abn/:/jcdv(err9/vz 0mu eb tron?

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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 happens/0q iocjd 56vi6b txa- to the magnitude of the force on the first elecqoi/50v6 i6b adxt-cj tron 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 b2n7s u+kzn6su/wz 5 v1.0 m. What happens to the size of the force on the proton if the electron72uuswsnkz6 n+ /zb5v 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 shy xr1dz/ 3f.bhvx6k *econd 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 the3br.xk/dz1vx y 6fhh* 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 place; . +3-.cn1nivtyts ggw q/efhd at the centroid of an equilateral triangle. When a second charge of +Q is placed at one of the triangle's vertices, an elec1wcggie./n-ttqn ys h3.fv; +trostatic 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 ve1q+7n9lg vramctor?

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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 (3g:,l1ucl+ nd nu;yeij+ jaa 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 poode+3 n8 hh3x3 5shytxsitive3 ntxe8y 5ho3s+3hhxd charge 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 fieljt0ah8)* fpa ud value between two positive charges along the line joining tha)jtpua 0 *8fhe 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 psitive poi+0* khy8vf2bn 1lhc kknt 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 shoeo/ux(qsmq 5/jl5 1lt wn


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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 inc53edum . x4tbtersect 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 uniform ele2zhxix6o6 ap.8 kr 8luoe,(sgfi;rf 6 l4b7atctric field. Give a statement concerning the electric field in the block's o(8g7 4hx2if krepofszbx,ra8 66i 6lu ;.talinterior.

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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 diamete-e) /krwek4gnrs are each given the same charge, the electric r w 4n)k-ek/egfield (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 wooden tap ;h1w nhx zw3x1:6cf 9v9fus pl/ewv1ble in a region where a uniform electric field is dex v f u :1lh1 x3;fwn/cwzp9v1pw69hsirected 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 inmo,zhvr7,t(g ;* uu( pdzt6 lh 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 ho ikp4xx8p) v.gy 2.x)i*znidu llow metallic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a point directly above the hollow sphere)2zin vdxgyuxp ) .ipk*8xi4. 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 equilibeapa28bhl 8d (7u (tw:sz8usbrium.
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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 oii+zh. +-iu obne 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 more protons than elehffngr1p) v *)ctrons doep*rgnvf h))f1 s 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 fo:i e+l )m-+1hfvbm tkg 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 u5f,ent xc: k,j:tlr3 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, separateic csujks1 i(w ,(e/w5d by 1.5 cm, have charge values of 2.0 and -4.0 mC, respectively. What is the magnitude of the electric force between thew , cie(w5/s jsi(kcu1m?

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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 forc1rb+;) nqqe*csb i6hse between them is 1.0 N. What is the;b)si+qhb*cqr6 s ne1 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. How far apart : :o7zwxz*n qplwca2fw4d m ev ;o207fare 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 y 0htse j+p)t/qug 35qvpw5f8$30 \; mC$ 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, initiallockm-hw jr 7w5d *(d g7e1kx;ny 2.0 cm apart, experience a 1.0-N force. If they are moved k(;c71w-m dw*d nj5kxer h7ogto 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 plac:) 4j5po p(y8p3uljhnfyr4 g sed 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 charge at4spj ul3fhyo 8ygj5(4pp: n) r 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 t e,w+s nju;/l8 .rdn ba3heuq5he x-axis. A charge of +2.0 mC is placed at the origin, -2.0 m C to the right at x = 50 cm, an+s nuej.eahr3unq,l8wb5 /d ;d +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 located at the following positions: Q1 = 2.00 mCq ca+9,j7v1byql 6 efvy (g8j9rbcsp3 at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.00 mC at x = -1.00 mbvcy91q3 c8 +gj 6vb,qjp eyf9 asl7(r. 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 of a sq3 dxr-f3 bqmo2uare, and a second point charm- b ox3d3fr2qge 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 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 1lme*6c gi18;j rs qht(0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the ma csmei18jrg 6qh*t 1l;gnitude 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 na;1vc:sg4zck + j8ti is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the direction of the net force on a tjsc14;gi z :8nc+kvthe 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 vertices of an equilattx:g ooqn64g7) f 9adteral triangle which measures 30 cm on a side. What is the magnitude q67gdna9 xtt4f:go)oof 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 7w 5r xb*hujje w.,;1p2wi2fp kxb5hm and +4Q, which are separated 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 force acpx*w. e;5bkfxpju2wwi r hmhj2517 ,bting 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 = 6fvm-e8g2a sw 4.0 m. Where on the x-axis can a third charge be placed so the net8a2 fsvw-6 mge 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 orsvh 4ulk4.e3d n 2v8oowv bt)(igin and charge -q is placed at x = 2a. Where can a third positive charw 8vosn4ku ho4d.v ( belv)23tge +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 mass of 3.0nb36 fzdrnp6 *hu09tv*q t5ai 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 gravitpx*l liz4e5 zc x)6h ob2nz2+tg)6hd xy by the attraction of a fixed proton some distance above it. How far abovez2bl2i nzel gp c+hz hx )6xx45)6tdo* 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 (sgeyqr*v0ltg n1*.1bc xniyj,d7y9nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces t( lg0y1y *b7t ge*.nrc 9qsyxv di,j1nhem 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(ua( g-gu2 jbfr)7* dxmd) caj. What is the magnitude of the electric field at a distancedju *2(d)fu7ra(j g)a xgcb m- 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 ec,)oogaif7ig xl j umhx4l3 h4x**/-electric field at a distance of 1.50h- ) l4* xxucixghal3eo g/o*f ,ijm47 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 from a smlj+qaqa;l8anhf ve8;8nd0v9all test charge. What is the magnitude of the electric field ;+ 8hd8 vlj0ev9qaana8l; fq nat 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 from a smal2dy )dms w(x4prn(zujqr7,i+l test charge. What is the direction of the electric 7d zs,p)d((quxm4jrr+n yi 2w 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 chargex3- vct miog. (cw0;zh. What is the magnitude of the force experienced b(w o.v zxi0c g;m3t-chy 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 disu72qz g0mz .w w,jclg5tance of 4.0 m. What is the electric field at a point midway between the two chaljw.u5zc 2 qgm0gz7w ,rges?

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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 c+ um4ot7jzc( ,v*id lwm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. What isc tjwl7 diouz ,4m+*v( 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 d 4 dm-lej1a+athe 0 cm 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 cha4-je 1+aadd lmrges 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 lei1cxg,tc:29fo b. )mld)w lln:;u wand -7.0 mC are placed at x = 0 and x = 0.20 m. What is the magnitude of the electric field at themlt.cnol9c:f xedlwg, wi1u ) 2): l;b 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 thend38yxkp/2 py mk0 t.k three corners of a square of side 0.50 m. The last corner is occupied by a -3.0 mC charge. Find the electric field at the center of the squ.ypnt8m3xdk 2pkky/0 are.

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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 tr s0ea5csey; a8vrq+.m;;uglt, b uy:he corners of the square as follows: +4.0 mC at (0, 0); +4.0 mC at (1, 1); +3.0 m;:ussq;cerryu + m 8tyaba.e lv 0;g5,C 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 mC when it is placed in a uniform ele:o*gwgbq / ;rc)p 46yal)rhbyctric field. What is the ;hwrop b/qy*))64cyg:rbg la 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 v8p lc5kce-3 jof $5.0 \times 10^{-3} \; kg$. 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 is plaukozqrza(z /./;ax4 ql z0u(e ced in an electric field of 6000 N/C pointing downward. What charge must be placed on the ball for it to0zrxkaz q (a z4le/qu/;.z( uo 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.qat05ukk1g6 e00 nC. The ball is placed inside a uniform electric field, and is suspended against the force of65 aeug q1tk0k 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. ibav+s:zl 1w jcu58g- 9vex(uf3e*sa What is the magnitude of the el -1vu:vle5e *+u3f9c basjsiwz8(agx ectric 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 radi 7.zgj z szvaxn**ifz:;n:fv+us 2.0 cm carries a charge of 3.0 mC. What is the electricz+nsnfvfzi a* z;j.:g v*7z:x field 6.0 cm from the center of the sphere?

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