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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 conservatvz5gny . z*g4h-t-s plion 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 ne:iqg;uxkb) ;iu9) ue /sdri:c gative 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 and av-1 ax -fqps.z 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 withui( i te1+nf+mnm *slrk))f4l a piece of silk. During the process the glass rod acquires a positive charge mn s* liti1f +fnu e()r4lm)k+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 shows-ojm h86x a:e;6jw hpx 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 alwayse dx70calz -(c9mspq3o7/g eu 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 t ,uzdn7 zit9frq2f;y6han 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 electrons are bound very tightly to the nuclei ar9y ab j6xcri;b*3-ge ee referred*bg e96ri3jb-xae yc ; 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 cs a 8+q;kw,dvnuclei and can move about freely within the material are referred to as akv8wds;+,c q

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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 bsazno 5/c4fu: lytkh 3i76y4 gar. The end offg/o 4hy4i5s3 u l:6z7 aktync the metal bar farthest 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,w(ms vu6fuxu5*mq n+1 and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly t(6u1qmswnux 5* fu+mvouched 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 s1z0 z6qj vc1q.gl)(oy8cb dm 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 briz q0/b*k po,h ncng. :ve;gdu,efly touched with a positively charged glass rokgqeh , nn.0:pcgud;, /*v zbod. 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 g3 mmowju7cv 9 j(58xl njf*r2trounded briefly while a positively charged 2jnwm (3lj59xj c78*mr to fvuglass rod 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 lb;(/ocze duw565mw wgeaves separate. Then a negative object is brought near the electroscope, but does not touch it. wgo;w6ue zc5bm(dw 5/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. kjy/3txe7g*g yjrw-h ::zx;t9j v1sh 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 stgstjh: h/g7 *y- ;tjx3xwev 9:z1kjryops. 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 b tm)q ;qhe:n3of+rm2Coulomb 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 b9bn6qez/zl 4 o(wtld 2y a distance d. The first charge is larger in magnitude than thzd 9w bq6l/ln2et 4zo(e 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 pl5duei8el .xio d*/74v1piwctaced near each other on an insulated table. Which statement best describes the electrostatic force bep.vddoi4e18 5ui cltxi7e*/wtween 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 tn6cy6p3:w7zezm;eh3 yl 50 vi tsr:vr he charges on both zp6 mz h viy5l 7; vyscnt3w60r:3e:reobjects 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 a)5tg5vp za c; d(odov/ttractive forces of F on each other. If the chard z ;ad/(5 v5g)tpocvoges 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 forc/)h vczguy n/c 73(llie F. What happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduclv( n )ygczlh7i3/c u/ed 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.n r kmsq+9rta/:)ia-i What happens to the magnitude of the force on the proton if a second electron is placed next to the first elecnmr k i rq9i-a:ta)+/stron?

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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. Whati1lkb/) qi +5.7 99omtuo zqhyaooh;g happens to the magn9yiotih)lo9zo+b7m1 a h;qo/5uq k .g itude of the force 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 separate- 9qmgg9nu vy1(w ym3yd by a distance of 1.0 m. What happens to the size of the force on the proton if the electron is moved 0.50umq-ygyw1n 3(yvg9 9m 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 second poiny3oj 2wzs)8t,qy.4 fgy.fqvl3sz f2 2ku) wtat 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 positive charge at the center of 3a)y w22fy3 s q gk yf4)fj.w8.u,vtzzto2sqlthe 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 plaowxgf1fcn m 4)tnv5j33fv.i5ni y/ f9 ced at the centroid of an equilateral triangle. When a second charge of +Q is placed at ow5tvnn /3xi j3f oynfgi)1f.cfv 95m4ne 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 following is not a vector/wzw:itn/db )vj0w . h?

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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 point0u8oy5 v0hlut 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 pos4l z-ke,k 0k9gmjsd1ge4 h4ddz 8hz1ditive charge along the li,ddjhl4z kdh me-1 04sg8g9zekz4 kd1ne 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 value 17; dv( 9emgswwzuw0z between two positive charges along the line joining uw7 ezmsvw 9;dg10(wzthe 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 pjmr)y7 i7 ;ue+z9xfvdsitive 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 showi *iicy6x)akbvod076 n


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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 spacmi0 ,d h:yce*pe?

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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 equilibriumrfp8* 4v j9 xukwczq(,8vjn9 3y lq-hk is placed in a uniform electric field. Give a statc3n9 r (9pzq8 4juy-kj8,lqvk wxh* vfement 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 hheg a7ap.afix i(n *(*u3:c dequal diameters are each given the same charge, the electric field (E) midwayc.ae* finxg*iha((pd7u 3ah: 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 table in a region mqz3yre2h/ 4q/s2 +dkoxc+xl0 xo p.4bufje)where a uniform electric field is directed straight upward. What can be said yx. oh lfd/+ozpqs3) +m0q4bu/2xk j4r exc e2concerning 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 electri f..*qc(meurpk7 mtgdon ;+6 kc 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 is groundw zf.m2 pd*t0ked. As compared to the case without the hollow spherk zdf.twm 0p*2e, 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 con2mjr 1 s,;wq kj)sk+kcductors 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 eledy/ gammh k6(7ctron 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. hkt9yiaq5) ) l How many more protons than electrons does this piece of pla qltai5y)9kh)stic 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 kedldai1)d75q*iya )o g 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 btas7 m9 y+lpnxa23a: 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+dgm22k5 e6dd e+jp by 1.5 cm, have charge values of 2.0 and -4.0 mC, respectively. What is the magnitude of the electric fkm 6bdee5j+2 pdd+g2yorce 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, a pnoikc:cp m:oi9opp5k)s mvh* 1-l14 nd the force between them is 1.0 N. What is the magnitude i-ov sokm):11nil 9pphk54*mcp :pcoof 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 a6, p*.qfrfvha ;rlxt0zy /l v2re 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 urz0 m x,px3uk1fb /b;lraf+b c 5l5m/$30 \; mC$ 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 tf 8x c v*oh ;:kiet:.g,ur6vhthey are moved k.ev, h;uh6oitcg*x8vtr : f: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 placed on the x-axis. The first chae;8xrwlcuo3k w/f; ,9f o:qg arge is at the origin, the second to the right at x = 50 cm, and the thiwr ,l q89g3ao:cf; ;w/of uexkrd 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 +bwm.v6lllicl- 77 j1r 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 electrl . 6wrl7blcj1mvi l7-ostatic 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 fv2s; bk jzr r/dgt0f35ollowing positions: Q1 = 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = 0; Q3 = -5.0 /3rfd50rstjv g kbz2;0 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 then8) zd )-gq)9p/z(gvo skmevw 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 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 k/8)z-g msn(de g 9p)o wzvvq)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, 0.10 m); Q3 = 5.0 nC is at3qso9 ubv dsc73l *,mr (0, 0). Whosqm3cr 39b* 7ds,vluat 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..-v2gegco xo /0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). Wha.geo gvx/ c-o2t is 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 mC are placed at the vertices of an equilateral dsjya7l/s3hm; 7 y*zb triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the yj ab*sz7;/ m3ls dh7ycharges?

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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 +4u9kcnkb)9w /e6 r krz00t qz1hQ, which are separated by 3.0 m. At what point, on a line between the two charges, would it be posz60hkew1 tb)0krzu 99 /rkcqnsible to place a charge 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 and a +9.0-C ch.e6 rrdi;)rilz mqb/6qeo 2,harge is at x = 4.0 m. Where on the x-axis can a e6mo ;hbe6, r)qr.z qi2dri/l 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 arg /vzarj4e68t the origin and charge -q is placed at x = 2a. Where can a third positive charge/e48g a6 rzjvr +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 3.0 g. A x 6ln./pgiwzoxdd 9w vvl:893total 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 attraction of a fixedoa5) -;k,txj9qdrap 5 2hj/zexib m ;w proton some distance above it. How far above them hi jpb52x 5/9;e;wkat,qaojz)rx-d 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 spher2tji ohpb a*+gr9 sv(/es 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 o(j itsrvpbg + 29*ah/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 troh c*x0 j1tb+0asw9+so /nqyhe electric field at a distance ots1xnbhqj + 9r ys 0a/wo*+c0of 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 electric field at a distance of 1.5wvcq 5pg 0-b*v0 m from a 50.0-nCq0-vg*wbc5p v 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 ysrf/ng1ze )bpgt *v 7 p2e1gw+x2+bta small test charge. What is the magnitude of the electric field at te+ e)f2*zv 2r+gw1np/ p7 sy 1tbxbgtghe 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 smaz;yij6uv 27xl7 ,kspr ll test charge. What is the direction of the electr7 rjvkiz 7,xps6l2 uy;ic 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 mz1*rpt7fh*n of the force experienced by a 1.0 nC charge placed at the location of the test cha*t* fm71prnhzrge?

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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 af* 7 gess8l:af4pj y1wre separated by a distance of 4.0 m. What is the electr 4:jegasfls7 *1 fw8ypic 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 nu:.bhra.bc7 2u ;mirp50q8vuz b0f xa -4.0 mC charge is placed at the 50 cm mark. What is the elect:u.ap .0b0b r ;uq7h5xvzmif 2c8nrubric 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 jx5nb c 0o1j;s ysqzsy 3j-8m9iwanaos 5*)x4 at the 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 charges i j; y*y485xjaain)5w 9cnqmos1sz 3 so0b xj-ss 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 -5 o0*jzh(/uwltymd + bp /vh8zs6q9wa7.0 mC are placed at x = 0 and x = 0.20 m. What is the magnitude of the electu /tjy/zzwl9d 8h6bmhqw +5s v0*p (aoric 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 ow4. *24v, lkt folatj8j*i vaff side 0.50 m. The last corner is occupied by a -3.0 mC charge. Find the electric field at the center of the sqf 8o4*4ft wk a.t,2avvl*lijjuare.

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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 x ahta3b ,d-l4the corners of the square as follows: +4.0 mC at (0, 0); +x b,43-dah lta4.0 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 of 5.0 mC when it is placjwc ti ;lp q58 pqb,f.hf.h)7xed in a uniform electric field. What is the magnitude of this electr.fxfp;8iqhjct lb )w 7p,h.q5ic 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 hasq //ifk- -m-pmbq:hp s 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 is plakmlhq -o.9 (hiq7hhz8ced in an electric field of 6000 N/C pointing downward. 9lhzq ihkhhm(-oq. 87 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 0.1 g/0l5)x.vl hv ;rdyd- ubztv850 g carries a charge of -2.00 nC. The ball is placed inside a ./xv)8vdr-ub tgzh;d v yl5 l0uniform electric 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 of +2.0 mzp t9y :3w-hmp1wb8u7ci l-u nC. What is the magnitude of the electric field 5.0 cm fro u7wmp9tzbil: -u 3y1 wn8-pchm 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 electr3ys adb32c h*tic field 6.03sbayd 3c ht2* cm from the center of the sphere?

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