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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 conservationgojbg ) x;uy-4 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 ca9,kmz8t /v s y+v8cdnharges 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 negative charge to attract w tq2o3rgelnot.+ 1fw ,og./t 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 vt1b18ow*f9ps gi8 q: tabkl, the glass rod acquires a positive charge and the sibtoft wb p 1 gsv*li,a:q91k88lk

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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 atot uxc ba0tw*)*m 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 always3tjkf6qkreu0)lo 0 f6 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 electron;slq0jq1 3 czqe2 u*cas 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 electrons are bound very tightly t a9qtn6jj0x)bwxkv :8 o the nuclei are referred vx qa:0b 6wtjj)n9 k8xto 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 to4/xv xdj81 tmd the nuclei and can move about freely within the material are refer m8/4j1dxdxv tred 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 rodbry tx( 7;i93ubakp 0j is brought near one end of an uncharged metal bar. The end of the metal ba3k;r07jb ai(bpuy9 t xr 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 sphere B*r4g+x qt,g0v)pttf llb* 1vh is neutral. They are placed near each1*qp)+ hx4f tlrl0b *vg, ttvg 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 crdx j5 q2 --l*u9wnhdq ao2,tlharged rod 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 el(l dniu q0z4e3ectroscope is briefly touched with a positively charged glass rz (qidn 034eulod. 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 positively charit 39s24 rpp; fzeqbo0ged glass rod t eqzfp9b 43;i0rso2pis 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 touches69)hhd+j7 fljy p*k, e1zankvl 3q)wq a neutral electroscope, and the leaves separate. Then a negative object is bron q,*l)pf6 1qwjz3hh keajl+vk9) y7d ught 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 plact m.6+x6 ebfjped 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 6e+m xfpj b6.tball, 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 Cof-qdfglg3y-1 at:,y k ulomb 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. The first char* q)d/crg +klnge is larger in magnitude than the second +d* lkqg cn)/rcharge.

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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 ne+7ijhg )spw+mon(opbi j 2/x9vx*vd 6utral. They are placed near each other on an insulated table. Which statementjov6v*hog+i9p bpx2)7j s/+x (wdn im 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 certain forc, empte(+8 olne. If the charges on both objects are doubled with no change in separation, the force betw (ml8 ,epnt+oeeen 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 9t:adn8a()qk g*icxqd and exert mutual attractive forces of F on each other. kcia9 dqnag )*txq(8: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 q py-(p/,pny)fg 93g-apfy ip force F. What happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance betanf,gi-gyf) ppp3/yp p 9qy- (ween 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 happgpav oxi :5;d8ens to the magnitude of taop 8;vi:d5 gxhe 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 happens tkx97 xbq69oi p,wao0to the magnitude of the force on the first electron if a second electron is placed next to the proton oiq7 6ab0,xw9 oxp9kt?

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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 p h 8ne,9ti0njoo70) gnj7yf m+zilj-a distance of 1.0 m. What happens to the size in-tng 7j7)yho0onj9j z8lip, ef0m+ 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 the center of a square. When a sema 235rb:g03t,h z (gwgwuqyccond 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. What is the magnitude of the net electrostatic force acting on the positive charqr0 w zbg353,ha(g:mw g2tcuyge 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 atlbw*8 6qy f:hv 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.fy6*lh 8vwq:b 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 ihh8t7a8j ; i:br.lqay s not 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) y4pa(spl (6 ztvq.9tium pr8 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 um.sjg ouwd-+zi;p 53negative and positive charge alon.sm;u53gz jp +ouiw-dg 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 zero electric field value between tc jgn3*h w wuta68bww6i;1b+dwo positive charges along 86wi+uwj c*6bgd ht1w;abw3 nthe 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 point 33gu 0s,u:1m7-p z xra;npk)imjuz y wcharges

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field shjm ;7b:j,c*e+ha wip( mfje;jown


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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 spq9s72fa vy(dtqxc)4 hace?

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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 injdyqmuotj61zirbj5 e,s6v k+mh v/04 * qso +1 electrostatic equilibrium is placed in a uniform electric field. Give a statement concerning the electric f+ iv6h/j+mj1ky46q ,qoetrj5 0s omzvbu1s *dield 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 spher ctztj-d w3l h(65z1loe of equal diameters are each given the same charge, the electric field z13l (ttcd5z-6j h wlo(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 )n3hlstcj4 tw50t 1w qtable in a region where a uniform electric field is ttl0h)wjq sc43w1tn 5 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 near an electricqi5j*l :oi 22kljj,ah 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 ground( xi7j ax 53(gepo*jr llx)3lied. As compared to the case without the hollow sphere, the electric field at a point directly above the hollow spox3gl3j(( j ai plr7xxe5* li)here 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 conah8 0/rvdb; 0dan gz9tductors 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 electron is qm55bx jbv.v-*yn)l 9cixx28gghoj 5$e = -1.6 \times 10^{-19} \; C$. 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 6kdp)ronx/*;mywnmy 6)6 eyu net charge of +2.00 mC. How many more protons than electrons does this piece of plastic w6kx d y))y*uo6/mer m;npn6yhave?

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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 )uhbb, e*; hsjof 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 ofbtk;kjh;w. nn2sp43 l $+40e$. 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 cm k f1rx, a qz.zh8.rk;34eisrharge values of 2.0 and -4.0 mC, respectively. Whaz i ;ek. qsr4hr3,zkmr af.18xt is the magnitude of the electric 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 force bet 4cfwsf07 97a dhpqslr9c00hsween them is 1.0 Nq s9plas0s7dr97cwh 4h0f0cf . 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 have a force betweewrao8m22)pg bf tf:,k n 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 k12rcg)kxr r lo4 md5g+op: 3w$30 \; mC$ 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, initially1ud,-y 7 evc ziif3-rp 2.0 cm apart, experience a 1.0-N force. If they are mov 3cpeuir-,d1 7ivz- fyed 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 poinp8 un6mj6wk2m t charges of 2.0 mC are placed on the x-axis. The first charge is 2kj mm86n6pwuat 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 the x-axis. A charge of +2cp1m igq0t2mn.(yk, f .0 mC is placed at the origi(mk cmfy0 1png.2 itq,n, -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 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 d2xc2 p+j n)ku + 2 xxjzbh)+rw(hgak2the following positions: Q1 = 2.00 mC at x = 1.00 m; Q2 = x hr2xkgn+x)2czw)b+ ajhjpk (2d+2u 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 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 point 6 t6uglqfa.8.bzyy+ scharge 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 theyg fzb.8alyq su6.+t6 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 (0a fopi7w;dld -hsk;s kz4+cl 7c0 p(k8, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of t+- o fl7d;li(s;zsw08pp 7ka k kch4dche 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 (0tx1vi+t t/j8f.30 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 ch 8tvij1/fttx +arge?

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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 plac 6yr7q+g rr-rded at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any ory+7rdr r-gq6ne 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 are separated by 3.0 m. Aa4p/pdx4+4z .fqlt zat what point, on a line between the two charges, wou4d pz+ax . f4qla/zpt4ld 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 origin and a +9.0-C charge is8 2fxdk fo:z)j/+o ew 3jfa-pl at x = 4.0 m. Where on the x-axis can a third charge be placed so the net force on it-2fe d:w+k)l fo8jz ofpx/aj3 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 a 4g8n7 -xmoajomp zs)di 4y09st x = 2a. Where can a th nyzao d7po9 4sgxsj8)m0-i4 mird positive 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 mc yyc;6m 10q uax5if2oass of 3.0 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 agx zm4i4(jw1:d pc6g fmainst the force of gravity by the attraction of a fixed proton sf :dwcig 1p6m(z4x4jmome distance above it. How 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 v fih2:b )rzn/are hung from a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces t fihb/:2)v nrzhem 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,tba qyd.vvkh;yqz+-m-.2t d a charge of +40e. What is the magnitude of the electric field at a distance of 1.ktm a.; d2v,.-q-q htybyd+vz0 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 electrtnu /4r 4i gd+hpy)3qvic field at a distance of 1.50 m fv) gdtr3i /u4np4q+hy rom 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 from a small testy8ipx*g(: muq1z e)g t charge. What is the magnitude of the electric field at t z) em(8iggtpux* y:q1he 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 cgwv, yb)meviyo6n49u* mqan4o,y 7 v;harge. What is the direction of the electric field? gyan7 wmoe,v*yn9 bo6mq )v ;44u,vyi

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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 magniil9i/8*2g eco :k ovmotude of the force m*c iogk:2l /o9oi8ev experienced by a 1.0 nC charge placed 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 z g(x:)qdfcg:a distance of 4.0 m. What is the cg z(:dqgx)f: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 placed at the 0 cm marsil8-+438qnim)6zmeq 1h xh dg 6 pae,a2v uulk of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. What is the electric fiel6,23 6meeu ai+8uq1m)nhl ld8pz g4ihxaqsv-d 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 cwu1 yroy oqg/),ohf+7m mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. At what point on a ,f1+oq7/ rgu)oyoyhwline 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/il 7f re-c,da:6ib2qgyynk; .0 mC are placed at x = 0 and x = 0.20 m. What is -;7/qiely:cdn 6,by kfga2r i the magnitude of the electric 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 thrj4ocwx, 3+s qyee corners of a square of side 0.50 m. The last corner is occupied by a4xcq 3j+s,wyo -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 1.0flm ,(7t .)thf24gd6z c dkoll 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); -3.0 mC at (0, 1). What ih 4 o.c),gtzdkl7(d mlf62 flts 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 o1t12 +0n.qfxjejjrb2 5 qtzc5.0 mC when it is placed in a uniform electric field. What is the magnitude of thi zt.t2nbcroj2 5q 1jexf+qj01s 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 o z5-uf6ptfk )bkj*0t af 4.0 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 nou4p sm.5 0ouan electric field of 6000 N/C pointing downward. What charge must be placed on the ball fon5p.mou o0u4 sr 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 carrih4x9ln0 k. jaa*w rf6aes a charge of -2.00 nC. The ball is placed inside a uniform electric field, and is suspended against the force of gravity. What are th.0*hjw an kxa 9f4a6lre 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 carrieh;nd ji8 pzk,(s a charge of +2.0 mC. What is the magnitude of the electrdh i( zkj;8np,ic field 5.0 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 charge of 3.0 mC. Whi9 f51w qwbjs0a0vk1oat is the electric field 6.0 cm from the center of the sphobafj9 0w1s vkwq10 5iere?

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