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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 con mb2;4cfzrv 17tsvg v7 y9wc6lservation 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 charges to attrazh8)3 (b2lufhnjr. xu) wcsr2 ct 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 nega;8 u;eceqpd ldy9( y-dtive 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.in 4 l5c4wvnf, During the process the glass rod acquires a positive charge an4 n5v,clin wf4d 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 s9 zzvgs x(jz)/hows 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 haskrfki/-hoan4 u1 mz* 5

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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 electr o3 5anbqqf .hw. grsb1i0d*e(ons 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 elec6ygxbg4+a 9r jtrons are bound very tightly to the nuclei are referre+yx6bag9g rj4 d 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 lol uz wvq aws8f**55x4qosely to the nuclei and can move about 4a5 fsv wxq z*uw*ql85freely 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;f5q /ao( 1 o3wxmr b+inx7omoar one end of an uncharged metal bar. The end of the metal bar farthest from ; qn35m7a 1fxbo(/io mxo+worthe 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 posit8 c76a+ tdpoyfl,1kp mive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Whptyd6omkp1,+a f8l 7c ich 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 positiv ; wg gbm8nijqc mn7;3;*u(itxely?

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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 positn+,cek7ccu; x ively charged glass rodux; 7nck, ce+c. 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 yo ck *fw: )bhmk;.zinac.*:e is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed. :h bck:y)i* na;fmc*woz.ek , 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 toucswlkhn(4 wa)0xo4cak g2;w6qhes a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. Whak046 ;w l)an 2ck4q(hgowswx at 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 og qg wwmfvz7bvh94;ii v1hme871*we :n 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 eithi v9vb1vmw4g wqwe1f *zh e;7h:gi87mer 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 o .xvj fv0w9s*)9lkll.ej7x8andlsi5f the Coulomb 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 bytd9wbg6xr )dy *h;p2z a distance d. The first charge is larger in9x)gr y tdp2;hw*zdb 6 magnitude 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 sphere B is neutral. They are placed near e)ymu6-o;o uq)2fa:l o0gi tpxach other on an insulated table. Which statement best describes the electrostatic forciqoy)oa6po u 0xlt2u)mg- f:;e 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 certalw7cclvjh6 6*in force. If the charges on both ol6l* v6hcj7w cbjects 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 ditcz3 )f):5a opxjq1jzz* d /zcstance d and exert mutual attractive forces of F on each other. ) /*: txz)oc13qdz5 jpzzcjafIf the 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. Wrers+gg); e t1hat happens to the force between them if one charge is doubled, the other charge is tripled+)rtsg; e 1rge, 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 2lifnn pt;ej2o t8ubpf c r.*+hc43o8are separated by a distance 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 ele . b; pn8te8uthfcr+ ip*j3oo 2c4nlf2ctron?

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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 separatefxc3*ztp ug -3iqz+/xd by a distance of 1.0 m. What happens to the magnitude of the force on the first electron if a second electronuzx-c3 fz/ 3+tqg ip*x 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 1.0 az)b w5 z0dz2km. What happens to the size of the force on the proton if the electron is moved az z0)wdzbk52 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 second pros qn:jxv-d)4 w9j9boint 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 t q box dwv-jr9)j9:ns4he 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 tri ( c5i38ndm0b.,xfzjgtxp5 z oangle. 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 acts on the center charge due to a third charge of +Q placed at one of the otht. of zdnzi 8b3(0jxxp5m,g5 cer 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 vectn) r dm/1d)qrhor?

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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 strengm8g++ 8e mu7dqvrwe*h e r:yy):idg,sth 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 valmj1. r ,v-qi+/+h;iybtaxq r iue between a negative and positive charge along the lij /rraqm++ .tiiy, iv-x1b;hqne 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 between two positi:: hk-96w dvib imqtnxr82p tf+ 1ev(vve charges along the line 6we:v:fiv-ix2m1dq+tr h pkn(bt v89 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 point cha z9:b -cahwlu.rges

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field shvk e 8xm,kk*2zown


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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 ink; 9orz va*u:v p3o:vatersect 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 equilibriumo (oj8 j)nczs9ps*t 41zsrn w4 is placed in a uniform electric field. Give a statement concerning the electric field in toz1swz)4p cs8*4(njn trs9 j ohe 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 equal diametvwu)5p cc 2 sxp,u)m,mers are each given the same charge, the electric field (E) midway besmvc,)x5 2u,ppwmc u )tween 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 where a uniform elitm r4( lb-3s ley9k4 gc9yg2uectric field is9kge mlu s-cry(gtb9 44y32li directed 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 in electr 9mb) yyqmw--tostatic 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 dk4o)qgwt* l- 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 hasl4gqw-k d* o)t

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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 equiiu,u 29jvv3,i upd1 zblibrium.
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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 zmbnqe8.5rbhl:u6v) 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 mo1fb0 sq;6 h43e twernare protons than electronsr64e qasbn1t;fw0h3 e 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 6,-a0*unbszn7v re1 sl0 13revrakkq 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 a cha oitqdwq / 7-)exfq)r*rge 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 bytdfi n(8 *zz8i 1.5 cm, have charge values of 2.0 and -4.0 mC, respectively. What is the magnitude of the electric *zz8nd tif8i( 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 forcen* 6.ny )u55vk+ wqhwbq 7xqa8*ubopj between them is 1.0 N. What is the magnitude of the se)q*8 +up5ab hxuyjwowv6 nn.5kqq7b *cond 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 9x83fu qw0o) :gmjv5ndejw fjam/4 (t 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 n-p/qs;c lxd 3$30 \; mC$ 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 ts:hrp,usvn*-*xp 4 nxm;v gwlp 5op:)hey are moved to a new separation of 8.0 cm, what is the electris:nps m4u**l5 h;r:p povvxpwng)x- ,c 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 char iw +abtxx4b5skl b5 ;r38rvz,ges of 2.0 mC are placed on the x-axis. The first charge l z 4xb583i,ba + vrtw5k;brxsis 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 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 yl(y +iotsc rvq0b6 w2w7r- ;othe 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 electrostatic force whichb+cy q vwwr0(-o7r2y6 to;lsi 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 =qo4 jy:w..y 9,zdvyt v 2.00 mC at x = 1.00 m; Q2 = 3.00 mC at x = y.o4,wv y9jdz:y tqv.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 of a square,4w*vjwxu jy* j )5ylt*z0h .cs 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 ths5**v 0wuy4.*xltcjy )h zjjwe 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 (;0lkap9wwx-d8uo1o5yh o hf 70, 0.10 m); Q3 = 5.0 nC is at (0, 0). 5uyol wd-ah0okox;f 8h97 1pwWhat 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, 0.10 m); Q3 = 5.0 no q/;p:v8r y aq;abib(C is at (0, 0). What is the direction of thrvqa(;8b:yq;a pi ob /e 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 8vz1bnqa9p j+the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic forc+a b8vqz jnp91e 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 anib md 1ugh06- 3tu1omx*qnrb,ni ) +ljd +4Q, which are separated by 3.0 m. At what point, on a line between the twm+guinjmx*db 0h3, ) rt6i-qn ub1 l1oo 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 the ori(zf(8ja- o q+cu2*njqwu ox3agin and a +9.0-C charge is at x = 4.0 m. Where on tj(oj+-qu2( wf qz3 uocaa* xn8he 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 the origin and ch1y jkrlp5 u:u8.gbve/ arge -q is placed at x = 2a. Where can a third poy ./er15u8pbkg:v ujlsitive charge +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. Abnoi +t r,qw-qnct 9 cadc l(i1v*o0-3 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 attr ul7d6 *k9+:v )gfqhdw0 wghnvaction of a fixed proton some distance above it. How far above the electrv6:n0f huwhgv7 )9 d+qlg *dwkon 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 tb m b)uk579wzogc-z3by nonconducting threads which are 3 w95ok u7b bz)z-cm3tg0 cm long. Both are given identical charges, and the electrostatic 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. Whai* b/kvd 8stv :04hlftt is the magnitude of the electric field at a distance vt8i/hsftvlk*b d:04of 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 i7vbe zjdx0 d-3/jsi3direction of the electric field at a distance of 1.50 m from a 50.0-nC c iz 0di3bv3- sedjxj7/harge?

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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 tl7.ugfc 8(xc)zlf cj ;he magnitude of the ele(fj8 czl)gu;xcl. 7 cfctric 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 direction ofpr7qkqbtyx1r; ao(7.5kx tv 4 the electric fi 7o7y5 . bka1xv4qtqp k;tx(rreld?

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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 chargx a.ee9:e yeov v(zx63e. What is the magnitude of the force experienced by a 1.0 nC charge placed at the (.eaxeex: ve6z 3 yv9olocation 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 separatlzk2 bbe52-7pe7se/t7ygy ,qlu z tt*ed by a distance of 4.0 m. What is the electric field at a point midway between the twotzgzy t,te 7bpkqy e2/5-2el7s 7u* bl 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 a -4.0 m.ovy 7b qhx(/f ikgx)9C charge i97vh)xgykq(.x /b ofis placed at the 50 cm mark. What is 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 the 0 cm mark ox vw-hf12kp1+nv9xwa f a meter stick and a -4.0 mC charge is placed at the 50 cm mark.pk-+x nvfvxa9w1 1h2w At what 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 of +3.0 mC and -7.0 mC are placed at x = 0 and x = r3 hkk,v(o ab u2l9k+a0.20 m. What is the magnitude of the ell o+k,r3v9bua2a k hk(ectric 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 sq nfo0f3*s+ isuuare of side 0.50 m. The last corner is occupied by a -3.0 mC charge. Find the electric field at the cos*ff3+i 0u nsenter 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 1.0 m on a side. Chnjicy./xf r 4u6o9kw. arges 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). Wha/6i f4uywcj.r no.kx9 t 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 3d3g u;xpl 6lmiq4wyxj(u)n6p0/mfda uniform electric /xgy lmw6 q uxud(j3fp60)4idmpn l;3field. What 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 mass ofwnsz /:jg : )art)+djs $5.0 \times 10^{-3} \; kg$. 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 g/ tf6 3no)dw7bh4gup field of 6000 N/C pointing downward. What charge must be placed on thdf)gwou7 p6h 3n/ bt4ge 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 chargc-v)3kw40xnlml xnz 5e of -2.00 nC. The ball is placed inside a uniform electric fzl 0 k-5vx nlxc34wnm)ield, 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 mC. Wr3 l) z-m,cij j).vz3o ygjt7dhat is the magnitude of the electric field 5.0 cm roi7 )dtcmvgyz3jl.-3z)j,j 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 electr9ea .kjd; tyf5fj 46 e5zb.rqzic field 64fjz;t zq65. efkab de5ryj .9.0 cm from the center of the sphere?

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