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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 electrni-)krh56xctps d;dui 0 7tf;ic 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 attr j/l /u0hb3tpxn28ixgk2m8ag act 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 8j5qy*s srw6fv.pj3b positive 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 process the glass o5o ozezp/ +x4(*dkjdrod acquires a positive charge and thej o*z5/ +xkdzoo4ed( p 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 ato+jsmkzo) gx7gppbx + *piu1q 56z/uh4m shows 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 hasux 89h yzlgi .vu3)fw+

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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 protonu lzqg* /rl36deal(j 6s. 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 v6xz:,;uue f 3ciid g, :t:: ivfy1rfngery tightly to the nuclei are referred to ,,te:di:ng6xu fzf i3;vfc: ig:r1uy 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 nba8 yv6901klq ue j1gpvg.jr+uclei and can move about e+u06.j rk1 qpglb v a9v1gy8jfreely 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 ne-f1q5dx;d1;a jo sjw har one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod willqhf1doawjds ;1j-x ;5 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 neutral. They /kbsceaa1:hlwo 5+v .(7f mbe are placed near e1vam. e hb7lek(+cwosab/5 : fach other on an insulated table. 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 positip.kjx5t- ox.ively?

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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 positimmbf) :4*y n(ng6puncfh2 j0evely charged nf4jce 0(u nh m2g*py bm:6fn)glass 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 b9zgl vx kl:-;1ex/ padriefly while a positively charged glass rod is 1/della z:vgx x -;pk9held 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 separate. Theuu6gl j- 7vl0nn a negative object is brought near the electroscope, b0g7j u v-ll6nuut 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 insulated table. A n)+zs td;0 t ysa70jpdfeutral metallic ball rolls straight toward the object, but stops before it touches it. A second neutral metallic ball rolls along the path followed byt ydpsd;70 tfz) +js0a 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 Coulomb coj5 +a hn)+ ;fnyz5ywuvnstant $k$, 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 chargeqr4a2pf ek55 uoh0e,yqq04(5ttppxe is larger in magnitude than the second chargtu5o(q f2 eph0t405q yr p ka5qp4ee,xe.

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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 chabylh +xm 5qwhrln2ok(a5mb5zs2 ;+r4rge and sphere B is neutral. They are placed near each other on an insulated table. Which statm4 2 a w5xh+bosqb2;55k(lrn+ymrh lz ement 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 of5l m+jeuq5c 2sy0lz 9vji3s:ther with a certain force. If the charges on both objects are doub:lljy qej 5 i+5s30fvz 9s2ucmled 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 fe-g,wei(gp2ov9x8fn ge p +f3orces of F on each other. If theiw8f 3 9 p-x,+feeggn2v peg(o 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 force F. W qc-5bh* /) 1ry; imh/gnpfflic1gjw-hat happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers i/n /f1 ;h1gw-cj-qlgi bh*cfim5ry )ps 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 offj2h fu+ms5u.6n q9bpsz em: ojkq:13 1.0 m. What happens to the magnitude of the m 6 b3ju19nffh p+zs.5 qouseq2mjk::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. What happeixz+irg , sy:)s; guc4ns to the magnitude of the force on the first electron if a second elec4xruz ,:sgiy+c;sg i) tron 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 prwvoif(3ol ge1h b23o3 oton are separated by a distance of 1.0 m. What happens to the size of the forv le3obh(3 oig o1f23wce 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 th7;g s 0, rr*rkhksikz:e 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. k ig*; ks0r7rrs,:hzkNow, 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 pnpm8h91sd8 3 7owff xrlaced at the centroid of an equilateral triangle. 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 8r1 pfdfo7sxh893 m wnacts 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 il mnk hi0eey-o4m5i,0x q9p 8not 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 electric fielddhupbf* k0a (5

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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 posijf m,yv tf9kpssn211q 1e+a5m tive charge alonaq11 nv,fj2 ptym +msk1s5fe 9g 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 z)mmxcr0j.m g-ero electric field value between two positive charges along tmcm)xrmj-.0g he line 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 psitive pointr1,pxrry h+ grg( /ea* 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 showtu5r .j ;yuheqeizhks : a+(dg2+5 5jan


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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 in free sn:f c,j;g iq4wpace?

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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 inr (80yhorbz/ b a uniform electric field. Give/h br8 y(rob0z 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 a pq62rmt- 5h (w qx6 e6f(ebhhd1tinrt,t0+qjnd a hollow metal sphere of equal diameters are each given the same charge, the electric field (E) midway between the center an(, 6 x hhqqeqw tp256 mt+jftb0(ird-tenr 1h6d 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 table in a region wa t3w+k2r n,ok+ upjd0here a uniform electric field is directed straight upward. What can be said concerning the charge o3tw o2dk 0kjnpar ,+u+n 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 electrostay(w41 cthl4eptic 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 n5:setxwc u65sphere that is grounded. As compa5 ue: wn5cstx6red to the case without the hollow 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 c bdgpx)k+yb8;v 0/nx+is; hrg onductors 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 3qmq4x)pdgyj:k c)9 kelectron 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 charge7m q, 8axpmtju9d(.fb of +2.00 mC. How many more protons than electro x,8dm jfba.(9qpm t7uns 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 olw pn 2mm;7+qdnz47 vmf 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 /)x7(*zycwtn:+ *sn1 ftir jz hh4mtv 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 cm, have charge values of 2.5fxup3y(ht.8t va9 ai0 and -4.0 mC, respectively. What is the magnitude of the ely haf8a59i v(.p t3xtuectric 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 /q.0k9 *fi h:8oa /rbrtrk aqgforce between them is 1.0 N. What is the magnitude of the second cb. 8r* qi0/:ot/rkqfr9aah gkharge?

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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 are they?q r0 h1uqw*u+d

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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 3.ub rx*2kiboi)rp d; $30 \; mC$ 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 they 4i,i ; ge /fu(wqphiba( 0zw0bare moved to a new separation of 8.0 cm, what is the elecb0 ip0e(wiu(i4wb;zqhag / ,ftric 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 placed g sz+ fiab6cb47)l pd)on the x-axis. The first charge is at the origin, the second to the right at x = 50 cm, and the third ispa d)g+ 6 fcb7i)sz4lb 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 tp 7(rqn gjk)5ghe x-axis. A charge of +2.0 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 electro)k p r57qg(jngstatic 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 mCz+m0 f: 9fnbt3s3yrde at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.00 mC at0d 3r+f3 fsnbt 9e:zym 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 of a square, and a second pointxq h5c sgx(l3/ charge of -Q is placed at the upper-left corner. It is observed thxh /5gqx3(c lsat 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 (0, 0.10y,hp 5fw 6+.-+rcy ibj qve5p,9durda m); Q3 = 5.0 nC is at (0, 0). What is theuar e+dd ,56y q+vr5jip,-9fp h.cwyb 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, 0.10 m); Q3 = 1v.s70kwm.g6bne revkje ,(i 5.0 nC is at (0, 0). What is the direction of th .g.0ve e mek(6,nv 71kwsjrbie 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 mC are placed at the vertices qq4pn-*q ww0oxj 5 b*/h o;wpnof an equilateral triangle which measures 30 cm on a sidepb q;wop4wwn05q-ho /*n*qjx . 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 +h4c, chaqhq,-g z2d4w4Q, 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 acting on it would be zer2c ,cq hzga-,h4dq 4hwo?

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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 thchiw.eu:k t+uj4m pn. bw 0u7im;6e t5e origin and a +9.0-C charge is at x = 4.0 m. Where on the x-axp0ubuew7j54 6tme:tkwi;c h n.u.+ miis 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 =zknms t.g+(tf5* 0fuw+r yx b, 2a. Where can a third positive charge +q be placed so that the fbwsr+ftg 5.k+,(n xufty z0m *orce 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(yl cb ow1;c6 n+s qx7bttahax0a*2( z.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 fsv9b-0s -tuc gravity by the attraction of a fixed proton some distance above it. Hoscvstu9- b-0fw 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 sphegg j4a 8k1gvom ;rg45z2a6kgjres are hung from a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle between the threads is j4makgrgg2aggvo 8146k5; zj$20^{\circ}$. 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 thdluk tp7n: :aoj6)* qze magnitude of the electric field at a di p :azkt*j:nl7 q)u6odstance 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 el8pt z p-z:x(meectric field at a distance of 1.50 m from -p( pmez:t8 zxa 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 small test charge. What is t ,n 13wk7cxlw d).:hr6dojbmthe magnitude of the electric field at t6:croxt73kww)m1dj l. dnh ,bhe 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 small test charge. What is the tl-4pk*kod5evij t: ou *q4+ldirection of the electric field?p *+ dlt ivl 4ku4o*:t-k5eqjo

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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 w ;c0.6y ol++ygib2yeb(scav the magnitude of the force experienced by a 1.0 nC charge plac;i0 ys+y ybwc o+(26acelvb g.ed 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 dishzafzzn4q 8g6v1n;) - -jbrbgtance of 4.0 m. What is the electric field at a point midway between the 4 b-fhzz8 vnq-1ng)zag rb6;jtwo 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 markgf ioqcyw9dyc) 2hf9t v 4)1m36eq9 tu of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. What is the electric field at thq9e9362hgiy f)cu)twto19cdy v 4 mq fe 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 meter ste 1 ige8r(xfln 5(ea;nick and a -4.0 mC charge is placed at the 50 cm mark. At ;(15xer(8fea e li gnnwhat 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 ofb b x3.zo1(q4bterv- u +3.0 mC and -7.0 mC are placed at x = 0 and x = 0.20 m. What is the magnitude of the electribq3-( 4e1vub b.xotzrc 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. p ggq ug 08la3s vqb1zsij*68+The last corner is occupied by a -is*8s3uvz 8q +g60 1gpbqlg aj3.0 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 e)eo vj*ixcdo4;) art j/gl9 :1.0 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); j r)4ac)g ;:ovxoelt9*idj/e-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 electrv8fn(l w7.bzric field. f 7wzvbln. (8rWhat 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 mC has a mast )imwikcy 9.c y8,e9os 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 is placed in an electric ff:i-v 5q2 pegejt-q1v ield of 6000 N/C pointing downward. What charge must be placed on the ball for it to be susp f:q-eqgvp21jivte5- ended?

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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 nt ey53inx2 stw,ogb/ ;C. The ball is placed inside a uniform electric field, and is sus3,i2tent s y/g;wo b5xpended 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 of +2.0 mC. What is the mtu )h4 c4:gjskagnitude of the electric field 5.0tsk 4c g4):juh 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 charg7gf6- z .zma:7jdwcma e of 3.0 mC. What is the electric field 6.0 cmaz7mw fj .:-azgcd 67m from the center of the sphere?

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