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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 ofbg vf(1jn x7qj ue7z*5 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 charges to attract eah;m h*snf4ja4ch 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 4 7,:,3a a0dpk)b cp btr/dwabsd sl2apositive 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 po owi6*xqor.m * exeffk .*hi)x63k:b iece of silk. During the process the glass rod acquires a positive charge an w.rhe.eof3 *i* i)x:66 kboqmkfo*xxd 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 shbrx l+4fl(00ed* sku tows 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 har37wd1l 26rj vvblx:xs

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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 prot2ln1:izouo(v(uu; m5jb8yp j ons. 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 tightwl 6bw(vzgj/f3tl z-7qy*0 rx3 m zr;jly to the nuclei are referred f(w3 m 3*7b y zlqrx6;/vztgz lwjj0r-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 nn)5v+u jj)u dpuclei and can move aboj 5pjn) +u)vduut 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 ofr:+9 hz k4behpv9n;nl aj) a9q an uncharged metal bar. The end ofz r+npq: lv94 9kbe) ajah9;hn 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, and s9a)enz)s*z kdphere B is neutral. They are placed near each other on an insulated table. Sphere B ind)e*azk z) 9ss 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 ro/mr:9g41tqb6c cwyv y d charge an electroscope 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 bfc8 drnee. 2:yriefly touched with a positively charged glass rod. The r8ef e.yc2 nd: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 br-3go xhubpe: :pa(3s riefly while a positively charged glass rod is held near it. After the glass rod is ox :3hppa(3es gr-u:bremoved, 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 neutrn t v q:arb0anw3i-,(ral electroscope, and the leaves separate. Then a negative object is brought iartv3:n w, nbqr(0a-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 plan*:.oxsqd(w: ve(rm 0 .wqjif ced on an 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, but does not touch the negative object. At no time does either ball touch the negative objec.*.( vnwisxqoq w mfrd(:ej0: t. 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 Cou8w pe/re +vw;mj.j hs5lomb 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 by a distance d. Theynlox vw 2+fuu72 km 6tw, 4ntbjh(-4n first charge is larger in mwy624h -fbtjm tvl n 47u+2ox,(uwnk nagnitude than 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 sphb jluqc* ye;5 u(4(deyg(r.p 8seis8dere B is neutral. They are placed near each other on an insulated table. Which statement bestrjd u;e5idcy b yps ql(*(8.4es g(ue8 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. (bmd qe 5a-wmkaymcc*77b5: a If the charges on both objects are doubled with no chang75a5bwyek bmc :a-7c*(dmmqa e 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 dikhej/8x if l0+stance d and exert mutual attractive forces of F on each other. If the charges are separated by a distance ofje+fxh0l/ ki8 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 qrt,zbea3m0pda,w+ m lpm r 43)-ma6m a force F. What happens to the force between them if one charge is doubled6mlepp q bmz -d,m,amm)r3 +w0at4a 3r, 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 distance of 1.0 m. What hipeh3 x 27l*y* k)shakappens to the magnitude of the force on the pr7lhpaex3 )2*kys* ihkoton 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 f*-xxh, -qpzgzukw+5778i p fkh* qa um. What happens to the magnitude of the force on the first electron if a second electron is placegi,fh* z+hxppz5*7wq8 u -k-q u7fkxad 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 1.0 m. Whahfrnngo4i a-d73 5 +2t 6q m-yikxi8qyt happens to the size i8tkih672 i3qn r+f yg-nymxa d-4q5o 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 8e+zabah+ as2 53gt2whr* p qdthe 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 other three corners of the square. Whaaa2q sh 3+2hdgze5w par+tb *8t 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 tria) q u3csj5hm+xsn/so/ ngle. When a second charge of s )q+ho5scj s m/3/nxu+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 following is not a viv:mx8wsjs i(+li,c3v nk+) uar8bo 4ector?

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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, then -l k gve10g69r2 w6vyw7lhyy 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 posity u rmbi7xb7 8e7j- 2ve9k g*wa c/)q5:ylmcosive charge along the line joininjmscex y5)9/ qbu : cw8gir y*oklvmbe72a7- 7g 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 between two positive charges xg;a(w vta y66aloxv w;a tg(ay66ng the 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 5 gfahx2 edpwdt 1zcyv 7q/q9b57vj 08point 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 shown ig5i e,.ud * a uko1p6saz55eb


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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 space?30j+ /+w g:lxx tcx)+ kwewzyo k;qq1q

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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 equ1 z 5uvb9esl)rilibrium is placed in a uniform electric field. Give a statement concerning the electric field in ul rzbv19)se5the 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 spher v 4v,, wyjza:: cxn7zx:x5quke and a hollow metal sphere of equal diameters are each given the same charge, the electric field (E:n xwa v5xzc,xq,7 4 yj:uz:kv) 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 m-qc, 2gk;60kds- r0cgu0xi(n lidb mtable in a region where a uniform electric field is directed straig6; 0gkm ls-d(gc rnxbq2mi,0k i cd-0uht 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 a gmp8 9u7x:,k ,m9qikeij2zme n 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 i2 n+vrit ba7k(n a hollow metallic sphere that is grounded. As comparbi( nkv7ta r2+ed 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 conductors p ed+az 3zx 4s2 +vb-qiz/b6rwin 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 el x 2n9sk/6qe,mydmy,aectron 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, )tk.nhqqxdqn s3b57.00 mC. How many more protons than electrons do ts57,)n3qqxkdbnq.h es 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*vqzbjp (8:v 72o bew9yho+.aap*nn a 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 of c prpn1q *a2c 3-iuabt:x((mi $+40e$. 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, separated5xefa+os t b50*2 rf9e8z jvkk by 1.5 cm, have charge values of 2.0 and -4.0 mC, respectively. What is the magnitude of the electricok f5*2 ajs5etfb+v xk re908z 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 mt pmt082vn hz 0::*d t6gmwlmo from a second charge, and the force between them is 1.0 N. What is the magnitude*ntgotm: v tlmh0 0wpd68zm:2 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 ve6a j 1k:c(h. ;wxobnfar 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 / e -ymij;:bjj-jc9wu$30 \; mC$ 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, initial6hvo m3m-7 qqinh25,mchflv;d8t/ lx ly 2.0 cm apart, experience a 1.0-N force. If they are moved to a new 38v qcmh5 m72dlxv/hi,ot qf hm;6n-l 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 k.1w (;wb t sidmis( azj008b7iuck n,placed 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 magnitu8sj0 n1.b scd7k; ik z(mtb(,auiwi w0de 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 mCwh pvp);8h(gg 1p- yq2a)myd*fjb*m p 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 electrostatic force which acts on the charge at th m pah8ggp)qyb1;-fp dw2v(mhyj **p)e 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 are8x 4vxv l(qc/2mwtim ,mvj .p. 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. What is the magnitude of the force on the 3.00-mC charl, m.vcw v x(824xtvi.p /mmjqge?

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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 tkku -i,d1f1t phe 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 ck ,k1-1pf tiudenter 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, 0.10 m); Q3 = 5s.(9rpn:oycplwt* w4 .0 nC is at (0, 0). What is rol*yw. n4scp9tp:(w 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)pqti-c+;w h 4krk a2)6hkhv6 p; Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the directio6 p i2hq6kp;hawvr ht4k+- ck)n 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 az8 bf6p-tpo8c w/5tf51ni;u7;,krwntw qlq equilateral triangle which measures 30 cm on a8pu5 tk,wlb;iat681/f7npnzwt -; 5c foqqrw side. 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 +4Q, which a. :rmt:dj i0ky:nd y*zp.)f dtre separated by 3.0 m. At what point, on a line t d :*drzpfji:. k)d m:tn.yy0between the two charges, would it be possible 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 t;p yimz9z8 +bihe origin and a +9.0-C charge is at x = 4.0 m. Where on the x-axis can a third charge be placed so the net force on it is ipyz89b mzi;+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.* 3m7hki.pt 4 6fdpabj Where can a third positive charge +q be placed so that the t.a*pj76fpkd 4i b hm3force 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-anlu b+jx, i g3w8pu*. 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 attraovttm/) 4al s-4nff7gction of a fixed proton some distance above it. Hg 7stlfn t)v-o/ a4f4mow 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 *q(+kv -x ikgja94bdffrom a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart unti(avibxk+4q*- kdf9gjl 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 +4w u*zwv; (ix p bmzce2t+.j5v/0e. What is the magnitude of the electric field at tv2vw ez.m 5z b(+p j/iwcxu;*a distance 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 andn2x ku -h 80ncl25fyvw direction of the electric field at a distance of 1.50 m from a 50.0-n5k80l2xf hycn2 nw uv-C 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 4 ctlk0/w 2crpd3h-nodx ;9uzcharge. What is the magnitude of the e0cd pco/-kxtdzh3;4urn9wl 2lectric field at 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 small test charge. What is the direcd bv4.0uiwdk+p,9 )bhb ki/h/fjq)v u tion of the electric fielh/k+i pfdb bq. u 4,) vwubk/hij)9vd0d?

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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 tzm gwuar je()m7 gp4 bher-5::he magnitude of the force experienced by a 1.0 nC charge placedw4-z:ba m7g:(gpure re5m h)j 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 ea r0l6xu rivq12)sn)xgch have a value of 3.0 C and are separated by a distance of 4.0 m. What is thgx 2lvnx06) rqu r)1ise 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 pl 2 zuba axi/b9r9u(hl .sw2kk4aced 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 e4z9x a .uh9(rkk/ibsa2w2lub lectric 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 thpf*zi 5d t/o8re 0 cm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. At what p/8 f irpz*tod5oint 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 placed at x = 0 and x = (jf*y g ts6vl.0.20 m. What is the magnitude of the electric field at the point midway between vf t.jy(6*lsgthem?

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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 squmv8(* maazkrovus14 f1/0zjyare of side 0.50 m. The last corner is occupied by a -3.0 mC charge. Find the electric field at the center of tvv (*0 zf8mraa ouykj 4ms11/zhe 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.yl cc59 zjm4y- 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). m z54-lyc9 yjc 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.o wk(kvb, w31h-(xb hq0 mC when it is placed in a uniform electric field. What is the magnio,k q 1 hhb-x(3vwb(wktude 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 maq3yug v, its: ;,;hgrvwpa(.wia;a +oss 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 gquvvb7 i+1(,bff3da m is placed in an electric field of 6000 N/C pointing downward. What charge must ia,uv v3qf db(1+ bmf7be 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 i39k8zz i2bkpw-fjh1rii:.5 gy ie6c.00 nC. The ball is placed inside a uniform rwyie j. ih5-ib32 cpgf961 kk:zii8zelectric 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 ci6ift4wl hs22m carries a charge of +2.0 mC. What is the magnitude of the electric field l64w t22ihi sf5.0 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 cha (b7x)r8kx9mxv)ijdg rge of 3.0 mC. What is the electric field 6.0 cm from the cxrv)m 9(8g)xi bd7kjxenter of the sphere?

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