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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: 匿名未登录  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 electr rtp+c wf3w+:kic 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 charge;rd p ;;uvswe6wofs*1 s 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 a neg-n7;lft neip hw---p fative 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 g*li(wth6zfob7 wd 4 7hwc7m. with a piece of silk. During the process the glass rod acquires4mi( o. d7 hl7g7fw wt6w*hcbz a positive 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 + rhzvs as.e:1shows 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 ha8r ncq.gu 9ge-i5 3gras

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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 toscy b g)jr.2 q 2:0o930dloexar.eobhan 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 aret((y7cd kz: ii referrei7c :dik((yztd 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 eyt(cosv 3i-+64c eox5 pouf 9oml)tx8lectrons are bound very loosely to the nuclei and can move about freely within the material are referretces(6c m)fl8-i+ vo 3o yo5xutp4 ox9d 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 of6lz-ayu9uq8 q 1 hv5as an uncharged metal bar. The end of the metal bar farthest fromaq96yqua l1 svzh- 58u 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 bwy. 1v,9p0+i;b go:ikz1u6em lg xbz B is neutral. They are placed near each other on an insulated tabl0 l 1,i : vkgb.b1;oxgy i+6zbzwu9peme. 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 (: exmoeah2vv4tr 1b 46lunnpr7u*)selectroscope 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 withitbuv;m)p) aqt* 2bj - a positively charged glass rot*a u jqpv;)bm 2i)-btd. 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 briefly while a u nb6h/,:+cu 0zf4jmr 5i ncmw.m.tzmpositively charged glass rod i,z+fmzm / c.:h uc5mu btim4w.nj r60ns 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 leaves o/vcl5 60ikp2rdm8 t gdblt 5dt-yt45 separate. Then a negative object is brought near the -4t 2k 5goy6tlti vr8pd5tdldc5/mb0electroscope, 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 pl .**v bnyekw+bgj.nz u ke46t8,c0tiraced 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 object. Wha r8i6+bk4n,egw. je.*n0tv ku bczy*tt 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 conwep/ d e mw mozsyy f(u9,dv-w8r,ft8j i,0a*3stant $k$, 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. g ph)b 2nmg+tjir.lg+, c m,*a The first charge is larger in magnitude tg*can)r,2. plm, gjt+i +m gbhhan 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 nearxp(bj/uinz*z9 y8e: b each other on an insulated table. Whic8iu j/pbzy:z9b*xn (e h statement 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 other with a cml5,byr98,s ulg sp vtv03wz 3ertain force. If the charges on both objects are doubled with no change in separation, the force bet v,yr9l3pg5tu s30,lwszbm8v ween 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 o7 ngyx3x8, r0iuz s.fd and exert mutual attractive forces of F on each o7 s 0gxn8o. zxfuri3y,ther. If 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. Whxt(vpk(x3e cb5s(z :r at happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduced to one-fourth its origirk5xz3be(xts:vp c((nal 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 wf(hm2m )aa9r of 1.0 m. What happens to the magnitude of the force on the proton if a second electron is placed next to t a29w(mh ar)mfhe 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.y- 0bo)lp-nza sye3 fz2abt 13 What happens to the magnitude of tzy bazfnt 01--2pob3)es a3ylhe 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 separated by a distance of 1r/h0pe077uyr )pbi5 wu7t/ 8kgovc pa.0 m. What happens to the size of the force on the proton if the electron is moved 0.50 7twpparuk7yicr 0v7uo 05g8)eh// bpm 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 u1r no+ gaes0,the 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, eruon1a 0sg+ 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 a4jb zxu ,d+hu/t 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 th ,ujb/d+hxu4 zat 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 noh5mk (y qo /yxhts7z:;t 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*m,0db qi kj9, lf6xt/g ve-cp 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 havno w)+c ed2;expo, xd+d;pri (e a zero electric field value between a negative and positive charge along the line joining the two (x d;cndp+xdwp)2,o iero;+e 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 q) 10sponjnojm8fu*m 0ck./bve charges along the li bn0 1m oj/f0nj.mps)cq 8uo*kne 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 o6x s uq :w.tp)-wfn.jk*w),sq*l zir near psitive 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 shoau1ke)c . egqp,kh0 udvb0v (: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 inte *4)+,m,ypvutt r doz-zuo;gdrsect 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 sbr*o: saomc , ./-wptwy-v7a is placed in a uniform electric field. v:s p cwtm7o,*rby as/a .--owGive 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 and a hollow metal sphere of equal diameters a (.(eju(bg +i z8xr frsf4thb+re each given the same charge, the elizg +e(h4r(xf+( t8f. ubbr jsectric field (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 tablu,tl. r l;( tske+*ykve in a region where a uniform electrlke.;*( +kuv ty rlts,ic field is 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 electrostatic equilibrium ne-:f j4givk- qkar 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 sphere that 0p0+mx bkdm .qis grounded. As compared to thmpqx.mb +0 dk0e 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 in staticl4 f gu 8e(;,o-qjzefu 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 o o2;3z-sqi9lwnkf c5ectron 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 +hr5zm9. unso22.00 mC. How many more protons than electrons does this piece of plastic h h9no.sm5u r2zave?

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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 of prot hv54,b 7:f iuea3vopyons?

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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 charf sd8ifiugo0 8+1v*go6k, t aqge 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 2.0 and -4m w gw 6da-)qanc- h2mu7-ek2p.0 mC, respectively. What is the magnitude of the electric foq wen7cap)ahm2m6 -w-udg -2 krce 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 for+tor,.y, ,l kmcr,n eice between them is 1.0 N. o,lkr+nc,.m , ,y rtei What is the 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 haa-( ;b)1unj jzdp9hzf ve a force between them of 1.0 N. How far 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 pkcy7 fhjlh t/,832z i$30 \; mC$ 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, eie9)bvyry1xn9 y: ;va*cir force. If they are moved to a new separation of 8.0 cm, what is the electric force betwe)brii yv r*vxe: ;y9ya9nc,1een 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 cha 5g g9agqg;6cbu7o*i yrge 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 6 yca;g7b5o gug*9qgiat 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 1o r8zudsd/ h* c;2guson the 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 elect 81c*hguzsusodrd/ 2 ;rostatic 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 aty h9w31xp+9nes g4apg 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 39g xasyn p914e+ whgpforce 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 ck fd46r/g9czsecond 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 corne/ cdfg4ck9 6rzr?


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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,yvn: c 4k-m;1 po)cykj 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). Whatnv kmo1pky) :4ycj c;- 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. p.,ft8r1qf0vdo uoc 930 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the direction of the net force on the 5.0 nC charc o9 o1tufvfdp0 r,8q.ge?

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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 pm*ipy xhf8 eqx398 kxh05e-;y9 lsorelaced at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic forcehl8;ie9xy9 *e-ph x ks0mrxeqfoy538 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, whichevu4ms hd 8:-:h14h,eosz7xbel xmz 9 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 forc -soe7h x ,4m u8:4ed xlm1bv9:hshzzee 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 ax+o nsxn6 +8cd +9.0-C charge is at x = 4.0 m. Where on the x-axis can a third charge be+6xxs n+n8d co 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 =vka5m 1:aspjb/ei;m0k, ko .j 2a. Where can a third positive charge +q be placed so that the force k a:eimpb5/.j,ka sk;0mjv1oon 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.ktso 3u*uz.9 o0 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 gravity 3xxi25)no r1rmqk5c kn4+a rk by the attraction of a fixed proton some distance above it. How far above the electron is the proton?k5r4i n1 x3cax5r)n+o kqr2mk

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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 hungn5 +w g26l9:7pc llm f-jbqsej from a common point by nonconducting threads which are 30 cm long. Both are given idenb +qlw5 njgsc6me: l j297-lfptical 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 +40ehkjrrt5o99 m6ks (w;r. What is the magnitude of the electric field at a distance of 1.0 m wjk rr hs(r95;9t mko6from 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 1qhhd ,15qdcc electric field at a distance of 1.50 m froh15qd chcd1 ,qm 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 sinwdjpe * a2 l2-f46i+ rs8lrfrom a small test charge. What is the magnitude of the electric field at the locatiorl jr6 wips8a*sl+i2fen d42-n 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 directl,n 16jvatvs 4ion of the electr6ns lv 1t,vaj4ic 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 yu-(xx(;vedxec1xz( ir8ymqs7 *q w) m from a small test charge. What is the magnitude of the force experienced by a 1.0 nC charge placed at the locatioe;s(irqx * x y-mx xc1uvdqzy(e 8w)7(n 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 valu9qup. nj6*lvn d*(wkne of 3.0 C and are separated by a distance of 4.0 m. What is the ele n*wpdv nk6lq9u* jn.(ctric 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 a -4.0 mC chapu91j4g,46 sp bmpv jxrge is placed at the 50 cm mark. What is the electric fiel ,69 1jpj4s4xmp pvgubd 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 j(tyl x3,f -/ c+zqm jfatps84the 0 cm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. At what poifc+xa js yt(f,pjq-lz4/tm83nt 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 aru ie/0eqx: i5eq qh2/ye placed at x = 0 and x = 0.20 m. What is the magnitude of the electric field at the point midway between them?iq exee5u/qy/0:2h iq

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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 squafl)*yji ra11.k ky xq(42qtry re of side 0.50 m. The last corner is oc(2r1 aky.l14r) tx*fqy jiqy kcupied by a -3.0 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 1.0 m on a side. Charges are placed at theivxz, ghoiv8y : 1yxtu08*j0 z 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). What is the magnitude of the electric field at the square',1zy 8ozxvg i:8vi uxjy0h 0t*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 chn, f*1rkqb mx5s ii62karge of 5.0 mC when it is placed in a uniform electric field. What is the magnitude of i2km5q1fi 6 krxbn* s,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 4.0vn7i5rohm 9n. mC has 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 placed in an electric field of 6000ir(d+h qtx)t . N/C pointing downward. What charge must be placed on thed (+i.thxtqr ) 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 ow)lc7 lbk*cr85 g7i)gv dg1h qf -2.00 nC. The ball is placed inside a uniform electric field, and is suspended against the force of gravity. What are g1ckrc7g qgvb)h) idl l*87w 5the 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 thnfy1g*9i,hbh8g b(gj e magnitude of the electric field 5.0 cm from th*yh98f(hbn 1gb j, gige 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 mCs) s/i ug/ert5;7k5 z rw1pknh. What is the electric field 6.0 cm from the center of the spher7nrs 5h sk;kzeu t)rip g1/5/we?

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