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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 2kw+ *;w- yeeq:oolksservation 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 attrwc4 *c(7efk/je 6l-fed c)fy qact 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 n-z(f) w x 958wymg/xwx jp0qmr 09tleeach 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 m.+q.9*85qpg tm gj,a ovs qkwr5+zcl a piece of silk. During the process the glass rod acquires a positive charglqkqos8p +zjg c5v5t a .* qm,.rwm9+ge 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 showjq kj9dxbm/ w ufj-+t323l)dls 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 harf- s4vw m:md/s

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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 pfr 9q7 5+3/wa tyvnwrsrotons. 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 are referr q8f ,s)e1jb:5o; xeode0te ssed tob8j oq; o dxe05:fs)ese,1est 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 lu*d.(jd;ry2,ci ( hyk7 udbw loosely to the nuclei and can move about fr7.y2(drhi l(wcu j;dyu,b* k deely 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 of z 4,/s bm7ka, a2u;wjmnq3kiaan uncharged metal bar. The end of the metal bar farthess7 ba4 wnm3k/u ; izqm,ja2ak,t 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 is h9lpk/qs7ztjzf2 -bg1 )5ysaneutral. They are placed near each other on an insbj-57tzqhyz af9s s/2 k)l gp1ulated 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 negativelyoep w2b1p*9dcyd,8 h.orn b/w charged 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 electroscope 4t zqzs t9 q)mif+wx2;is briefly touched with a positively charged glass rodfi+94zqqtxm zts );2w. 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 *8n2klmz 2me zis grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, themze*n k822ml z 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 zmw nnvb63 cvg*i*tv26eu 8q+wh.9 nuleaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to thnc6v*wbg9iq+ *n t2 w3.zvmvnu8 6e uhe 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 on an insulated table. d5vk7h p qxua ;yk-. rrs z1c585k:ocd 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, buupdkykc5.d-qhz7vka ; xo s 5:5rr8c 1t 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 c3 ci7awf xk n+lu7n6jcq8n, h+onstant $k$, 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 separatedymzyvimi( hj, s-,t:ae: 2l+ n5riof; by a distance d. The first charge is larger in magnitude than the2oi a:+ ylhs y,ier m,v5i-:njm(ftz; 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 :v5k nrs,bm3aeach othkbrn:m5v3,a s er 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 attract each other with a/r/qu 5kco9o / oimw4k certain force. If the charges on oqwm/ 9o/o 5/4ckk uriboth objects 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 separ3 dt-iit(cdy-ated by a distance d and exert mutual attractive forces of F on eadd-( i3t- ictych other. 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 wit7vy6a wdvl)z;h a force F. What happens to the force between them if ol6 yd;zv7avw)ne 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+lilzh-sn(0ht2n:o 5hjc 4bq*9 wqe sej9n c4 separated by a distance of 1.0 m. What happens to the magnitude-+e0 si q hq5jjchc9 b 44n(lh2et9swnl:*noz of the 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 haplywe3m3tlzzai1z,. 2kw ) oc i6/x w;tpens to the magnitude of the force on the first electron if a second /,lo. k)mz ltz62 ;iyx3wwa 1 tzeicw3electron 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 m. Whgfx; / vtfv 6d9t*gq5hat happens to the size of the force on the proton if the electron is mxtfv g/q h6vf5 *g;td9oved 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 at3oryov nwp+ o -rzo:0f8f 5cj otb1)5o 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 a+wo-1rv ocpoy: fr nj)o0tzf38 5b 5oocts 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 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 trixi j69 p2k06c tayy m93bntce9angle. 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 + ty3 p n2jm6x9bike9tay9 c06cQ 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 0wi*//2upv fijh-cqeis 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 p oysq*i ib3-,loint 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 i 7kj/.n m1 mbqkd3*p*bay)jm sjuqf 95oc)v) a zero electric field value between a negative and positi/ )bkam 1j7iy.f)jj nq9mk 5pu*socmqb *d)3 vve charge along 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 valk 2:3-x) 8ej jik1dbfjjy r:zaue between two positive charges along the line joinix3e j1jr fkj2: :a8kzb)iy -djng 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 poc**h r zj13zifint 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 showt +stgi97mx6 kn


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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 intersela hh5h3w5 .poct 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 is placed in a 1t h iys49s( 9b0uh (mzmau6cxuniform electric field.caizx9m(u yhb0 19sum6t( sh4 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 meta8/b i lwx7v www0-s.1i5rtele l sphere of equal diameters are each given the same charge, the electric field (E) midway between the center and the surfacet7e810 e/xrb ww5 sl-w.liw vi 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 reg*p33ee cj3i 6 7c u,:s7nfgtqq c6iaoxion where a uniform electric 733qe6g:i*x caq6 f ,p3s7ouicetcnjfield 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 near r k(. kvj64lehol mg+ vm3xs;dx9*b3man 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 awf + )j9al)sos hollow 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 hassj9a s+w of)l)

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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 conducta;e.k.0ed kq:3pkkk g ors 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 )wt6 c 7re5tv9aiz6xw$e = -1.6 \times 10^{-19} \; C$. 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 mv,n8 3l r 7rc( hcfp39yvs/luiC. How many more protons than electronrrc lv8(973f3h uny/vi ,splc s 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 omv b/sd1f/eb5lbne n5+*4qwz5ej 0t 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 charge tzl h93*q v-lhof $+40e$. 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 chane(ggx.t 59js 6y bw9t4p)bwwrge values of 2.0 and -4.0 mC, respectively. What is thesygw )jtb9.6 p5wbx4gne( t w9 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 be nwrz5.s/ qzd,- /l mfq3:bhm from a second charge, and the force between them is 1.0 N. What is the magnitude of tzlq mqbfrhn 5- z:ew,s3 /b.d/he 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 +w5ra kgx/pg5i lz;j4 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 aqe 4hc99eqb 9/4 qujd$30 \; mC$ 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 eqyz-jrwp +s1d(vv; xfb,30qforce. If they are moved to a new separation of 8.0 cm, what is the electric force betwee,1f-;jeqz rv d s(ypw x0v3+bqn 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 c0b,ouu4in4lwq2c pn 3harges of 2.0 mC are 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 magnitude and4p n,i 20w3n oqu4ublc 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 isax 66fc09br xbj;x5 y:zbh2te placed at the origin, -2.0 m C tj 90fxbhxb2 r5:bax ycz6t;e6o 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 the following positions: Q1 = 2.00 mCo0*m)e sqf5mu at x = 1.00 m; Q2 = 3.00 mC atu *fe0o)5q mms 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 squas7 4e-7z 5pr(r-j pzen;zbrh) m ovhj2re, and a second point charge of -Q is p 74z)7o;- rrp ph5nz( 2ebvsmejzjrh-laced 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 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 = -1.5mvkg+ eg0xl a00rot o,ek(5n0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of the net force on the 5.0 nC charge?g ka,k50n l0v+r (0o5emt xgeo

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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 (s oqqmlans6pq6nv;7i3l 0/d8 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 cnpqs3an0 v;8ql6qlm d o6 si/7harge?

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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 placq 9)zneib;t* oed at the vertices of an equilateral triangle which measures 30 cm on a si;qoneit )b*9 zde. 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 are separy/3lz . euydm9hg( ,r:j pq/uaated by 3.0 m. At what point, on a line between the two charges, would it be possible to py.ue/(p yu hd/qz,jl9g ar3:mlace 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 +s5 h ryzpf:o/t.s:y0x 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 /ptyx5ssy :ho:z fr.0it 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 = 2a. gk(7 n*kw:iqlWhere can a third positive charge +q be placed so that the force on it is zeronil:w(kk *q7 g?

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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 h6*k pxjqba )(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 against thv:m)r+lso5 m wgoy*w6 e force of gravity by the attraction of a fixed p :5y)r+o gm*wvmw6o lsroton some 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 are hung from a common p3n 6zz5mt5n w-d .rul unm 2wbo1nh0n1oint by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle betwee 0-5nb l3nntn 1wd6m.nw1ozu2zh rm5un 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. What is the magni(4 1iorsm;g n qcxh0bqxs-d)3c-lv1u tude of the electric field at a distance of 1.0 m from the nuhxqlrm )-40s13;1ciq(cnx d guo-svbcleus?

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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 fieldttc ,-oa-qomk7 6xv;w at a distance of 1.50 m from a 50.0mx kvt7w6to- co,-a q;-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 test charge. What hrc 8l m0* zj+wg3 st.;x4yhspis the magnitude of the electric field at the location of thl84t+s3jzpcy hs ;h*mwx0.rg e 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 sm0x*zjg1g 9i8-qj 0u m a+v)mhkh93plbte /qyqall test charge. What is the direction of the electric m+0/zj38q jg*h uq9)bim ptl0-g v9h1 xyaqkefield?

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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 y nd-d2(ne j pv(sq9/csmall test charge. What is the magnitude of the force experienced by a 1.0 nC charge placed at ( vy(s9qncje/ dn2p-dthe 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 he*wcwrju/me99 ngd h 9-r*(dfave a value of 3.0 C and are separated by a distance of 4.0 m. What is the electric fiel *n gdj *-uec/wr(ef99wmd9rh d 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 g oab6y4u-hu--k, yb.o kls3umeter stick and a -4.0 mC charge is placed at thk.h-l3o4b-boys,-ku ya u g u6e 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 tgqv az3tfr09zuf,* k :he 0 cm mark of a meter stick and a -4.0 mC charge is placed at the 50 cm mark. At what point of,9 f:v zq 0tga3*krzun 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 = 0.20 m3esfh2lf 7dc-qi:h cd l/utot 394(nr. What is the magnitude of the electric field at the point midway between them?37:o/hs4i dlter3c f-nqtcl (dfu29 h

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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 squareh.wg.zf- dyw4x c 0zi5pt5xt8o2 xh5r of side 0.50 m. The last c 5 5c0pwgr ox 24xitwd.. xhy58zft-hzorner is occupied 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 t 7s9jz3bh.3vz kpxnp1ufzh5*he corners of th*k3zz . xvj7pzb5hf p9uh1n 3se 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'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 a u.3m)j*6kigy al,m;bgv2sd electric fij)mdkg,bgsa* i2.v3; 6mauyl eld. 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 ota1r0tee,x ,q f $5.0 \times 10^{-3} \; kg$. 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/ * f x+omdhghn,8./ewrC pointing downward. What charge must be placed on the ball for it to be suspefn mw 8 xd,.h*r/oh+egnded?

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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 carzjq*6h b b;6raclq3- zries 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 the mag-*zrcb6 3j zabl6h;qqnitude 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 the magnitu)cr+nw 7wwd9m1 ip fp+lie*t1 de oft*lm)p w c+ nf9 1eir7w+w1ipd the electric 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. What is the eleow,lv4pzm + bswq- x*.ctric field 6.0 cm from the center o mwzbsxl+-p4,ov* qw.f the sphere?

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