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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 electric 6b.dal1,r q lecharge.
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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 a6l 93jvl8+o ax gtsb6ottract 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 attrmlx- 4py0qxg;feby5 7;yre z1act 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 a6oy48:qip :r,qgxni of silk. During the process the glass rod acquires a positive cragox:8 4i : 6piyqqn,harge 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 a7,r32 k2glrh kvcfgm/

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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 h:vd1n w.-ztui as

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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 protons. The ato*i deg awqql5n6+8 t:jm 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 are r k5btgd1g..tus-uay jc8w6bw3c*mk xoj7n5.eferret.8jdbgju6 a5 t5wuycnkb7k *.o.c m w 1xs3-gd 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 th(a-rfj*q :oy, b trp.oe nuclei and can move about freely within the material are referred to asr qy.bfr-j pt:(oa,o*

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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 unchargy*c r2 6k bss6 fhr+1owkx)xx/ed metal bar. The end of the metal bar farthest from the charged rod will be ch6of1+wkb/2rk*srx x)shc6y x arged

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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 is neutral. Theykdln 1mw-79a o are placed near each other on an insulated table. Sphere B is l9mn7 aw-o1kdbriefly 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 a6d74pg gnxn8sbjbg8j(m:)o 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 briefly ti -jjqdg0 hn6 1g1f+muouched with a positively charged glass ro 6j1ggimdn0-+fqh1j u d. 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 electrosco1+gsz*tak8abue39eg4s ),9 lbpr lb spe is grounded briefly while a positively charged glass rod is held near it. After th,lt3kal8 ea* 19rbs+gps4)ubzb9 esg e 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 separate. The a/,0iwgbu( eo zmau2dt5c6x/n a negat,6gixd/0au2(/ omc5ueatwb z ive object is brought 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 placed oxnr/ 6*4+lezwtvw55 ;fc apy 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 stopsflv*5;rean cto+z4wxp wy 56/ . 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 Coulomb consawi2,o7z zon +tant $k$, 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 qgab n8,. mp+qdistance d. The first charge is larger in magnitude than a ,pbqn.+ g8mqthe 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 sph .:)ccx1q qtwy.4 dkmxere B is neutral. They are placed near each otherxq)k1.: c xyw.4tdq mc on an insulated table. Which 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 attrdmuozh8 6aq6 1act each other with a certain force. If the charges on both objects are doubled with no change h1ozumq86 d6 ain 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 attractive forct.cg3ts6 kt.u2 kmqaqb 6u, z.es of F on each other. If the charges are separated by a distance of d/3, what ar3amqgttucq .z6.t b,s6k ku2 .e 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. j+4,fb rvh2jt What happens to the force betweejvr f4,thbj+ 2n them if one charge is doubled, 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 separam3xew2m4f09 n r w5l8gyzqxo7 ted by a distance of 1.0 m. What happens to the magnitude of the force on the proton if a secq 30rxe 8g7f9nolxwwmyz24 m5 ond 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. Whap.pkae 2xq mm52:c)yp t happens to the magnitude of the force on the first electron if a secxk:p2 a mpcq25.ym )peond 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 protonx*0nejej u( g3 are separated by a distance of 1.0 m. What happens to the size of the force on the proton if the electron is movenx eju( g*3je0d 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 p:d3 ofnc: fpy9laced at 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 of the square. What is the magnitude of the net electrostatic force acting on the positive chcy:3o nd :9fpfarge 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 placedo* ju.m2q3zxi-6assk at 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 that acts on the center charge due to a third charge of +Q placed akima63-jo u*q 2z.ssxt 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? d(/m i3n+gy1ladkg1q

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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, thxs- c82 j48j pelrsd:ytb1e2we 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 negat /yg,fvh,/d p* 6clr2mak vcd/ive and positive charge along ty*2,dpvkg dh6/c/l/va, m rcfhe 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 electricw :ck 76./ ;y) dylwsge vh.xntx:5sgy field value between two positive charges along the line joining the xygx h7.vkcdtn ;yw6) / 5 lsyesw:.g: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 po)lrbx2spq8n v7o-k h :int 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 shob2u 7 -:uy1g2rv-lhs ek*tbd mwn


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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 spac,8 vejoyc e3ja70i5nle?

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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 metalw1y9dr2p i / (+ggzsjt in electrostatic equilibrium is placed in a uniform electri gt+ r2w sz(/dy9gjp1ic field. Give 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 eqk8;j q b6pnf.pp *2rehdi:uw /ual diameters are each given the same charge, the eljeqidu pw.k*p28hnpf; / 6 :rbectric 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 table in dxd.-itmq/j8 gv 5k9l a region where a uniform electric field is directed straight upward. What can be q8jkdi5dvtx9.lm /-gsaid 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 e.rkpd*mwq+h gb3f-w: quilibrium 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 0 t +wmg7rdz8mdl+9yi is enclosed in a hollow metallic sphere that is grounded. As compared to the case without the hollow sphere, the electric field at a point directly abov zrmw7dit08ly++dg 9 me 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 condacle2gpj04wx 3 e) y5vuctors 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 electrowzuuwpo--c r. 7cu p8 c,4vyz.n 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 ofs-ut4ky v4 ,tzgm4 g3z +2.00 mC. How many more protons than electrons does thiyvmzt tgk4-4 3,4 zusgs 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 of proto6rf65 ,s.6 4cupcns qod2if ssns?

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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 charg,teqo5j r mru:wh92 /mo v4tl(r-p)rje 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, h3uwn:z*dfy.j wd m 7r*mx 3ot8ave charge values of 2.0 and -4.0 mC, r 7 8nrx3*fwmd.:omut*wydj3z espectively. What 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 char vgqf3.4ja sgy 1ic6z6ge, and the force between them is 1.0 N. What is the mag6fv as 3gcq6z.iy4 1jgnitude 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 far apart ar 0sgbhax 0)vy( bap))le 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 k 6fr2ykkg1u )g mhf99$30 \; mC$ 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 cszx81qobm/cxz1 q( x0 m apart, experience a 1.0-N force. If they are moved to a new separation of 8.0 cm, what is the electriqz x q0zms/8x c(x11obc 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 a2 xbp bz*xhx-s k+*es f+:p7ydre placed on the x-axis. The first charge is at the origin, the second to the right at x = 50 cm, x f dhy:k+ 7e+sp*bbpz2-xs *xand 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 +2.0 mC i0qe+0/rm usoy2 mho6-j tmnclq d;/ ,is placed at the origin, -2.0 m C to the right at x = 50 cm, anc,mqr/d omjq02uin+h m/6e;t s yol0 -d +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 avooav w1ctle9) 5i;.ut the following positions: Q1 = 2.00 mC at x = 1.00 m; e9v15vi)loaco.;tuw 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 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 - ola w2rqccln,ecv f*l h057 3tc0k,qis placed at the 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 ,l0of5qckc,ea l2 lq- *nvt 3 7rchc0wacts on the 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 (0, 0.10 mc0llc3lb* *d b); Q3 = 5.0 nC is at (0, 0). What is the magnitublbl*3c dc0l*de 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 nhnt))6ml)-5n3wbz)j p b nebfC is at (0, 0). Whw))bn356mf )zb)jp ln-tn he bat 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 un 2g f*sbb;uk/u-ec -mC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitu eu-b;nug* 2- cukb/sfde 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 are separated by 3.f8nx,xua cx34tf kos; x)2iypuvu6 */0 m. At what point, on a line between the two charges, would it be possible toikuo/u f4f8x2xc,yxvat pn3)u ;6sx* 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 charg41e )c seeh5ade is at x = 4.0 m. Where on the x-d 4 cesae1h)5eaxis 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 and5lblp kki8g/ :fl4ai 7 charge -q is placed at x = 2a. Where can a third positive charge +q be placed so that the ffp:/ bi 4lk58kli7agl orce 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 too*d;icgz8q 9m ao)1s wtal 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 aga;wu.) xswpzi/ inst the force of gravity by the attraction of a fixed proton some distance above iu)wiw z/ ;spx.t. 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 are hung from a commozulq5j6h.vlp / ,hx/-r8f(m fm6eeez n point by nonconducting threads which are 30 cm long. zj86mm u6 p lf/z h,.r ehqxelv/(-f5eBoth 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 chld djmgbr0*n 15 x:)dvk12 wkq-x xe;uarge of +40e. What is the magnitude of the electric field at a distance of xlgxnmd:kq evx0j1r2 uw 5)ddkb*1; -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 a9l+wgwt1sm0m4vy)hig 7h ,xjt a distance of 1.50 m from a 50.0-nC char 7gm4y9v)ixh1j h wwm,gts0+lge?

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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 tesijn:v/vn)ych1 (1n eot charge. What is the magnitude of the electric field at theoen/v:h1njv 1i cy() n 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 fromu aezed+ hq21; a small test charge. What is the direction of the electric fieldzd1+;q uee2 ah?

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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 nk 2kbq v* q;f (bd*foovl ;;:+1pqmvskx **dhcharge. What is the magnitude of the force experienced bkn *okp2lo d(bvx+; ;*1;ff*d qhsv k*vm:qbqy 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 Cw3w :dzydw.nuj*c)e9 tgh+4e and are separated by a distance of 4.ujz*:wy t39we h wng4.ced) d+0 m. What is the 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 2imetl-j) k w53,fxbqcm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. What is tk3-)i,q2mb xtwf el 5jhe 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 of a meter stick and a -4.0 mC ah90pqwf.og f: s9tnny21p lxjn9b4vhx u,+3 charge is placed at the 50 cm mark. At what point on a linfn+av3: j1 u,9x0 w 2nh9.fg9ypbnotqlhsx4p e 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 5phu6- adro) y+3.0 mC and -7.0 mC are placed at x = 0 and x = 0.20 m. What is th56a -r)udpo hye 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 three corners of a square of side 0.5 6qtogha tu;x58,vz3 -vx6whx 0 m. The last corner is occupied by a -3.0 mC charge. Find the elexq6t- 5gth, x;axwvvz8 o3h6 uctric 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 qhys.7tjb tt,oub ;+aea9 c*h4oa68u 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 tha*ebt;a uyo6a ub8qs7th,co+. 4j9is 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 a uniform electt1,vsm 7 le rj1hbw0/lh9e7vpric field. What is the magnitude of this electric fies eh,tjv rw97bhev 7l pl/1m10ld?

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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 i1ydh,zyl h/,b* .yiya 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 6000 N/lg6qbnuic z c+w56 8+uva+ pr(C pointing downward. What charge mus(ac56v8wur+nugzc l+bi q 6 +pt 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 0.150 g carries a charge of -2.00 nmm p)eqf,h361i y nei4xy0 x*gC. The ball is placed inside a uniform electric field, and is suspended against t pgey410xi3 6f,)q enm*mi xyhhe 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. What is t-j2k1z)(19rwy) ircrdq uj0s cdn g;the magnitude of the electric field 5.0 cm from the sphere's0dyz ru (9 cn))rj 2rtd1gq;sikwc-1j 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 char1p* pf2o fbv.uge of 3.0 mC. What is the electric field 6.0 cm from the*.pfobv2u p1 f center of the sphere?

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