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习题练习:gc textbook chapter 17 Electric Potential



 作者: 王信东Wood   总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 04月09日 20:26  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  
If two points are at the same potential, does this mean that no work is done ih/rov29kbsa: n moving a test charge from one point to the other? Does this imply tha/o29kh v:srbat no force need be exerted? Explain.
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2#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If a negative charge is initially at rest in an electric field, will ihtu0 by*rj3i sh;*k/ 2vvzjf 9zh (+,ux+xo kat move toward a region of higher potential uz2s3/bxyrz(kuv+xhjt , f ;hh v9o *j0+*kaior lower potential? What about a positive charge? How does the potential energy of the charge change in each instance?
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3#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State clearly the difference (,s0 mk/zlrj-vre+q 0as,ae p*a) between electric potential and electric field, (b) between electric potential and electric potentiepraeq-a/v*,+ 0 ksml 0z,r jsal energy.
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4#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
An electron is accelerated by a potential difference of, say;f1ccx jn 4boswi.a2c. bh+g 1, 0.10 V. How much greater would its final speed be if it is accelerated with four times as much voltj.2g1hic;ocb.xf+wa1 bn4 csage? Explain.
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5#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Is there a point along the line joining two equal positive charges x-: zx-xmck; y-xlgy 6where the electric field:g-- 6; xckxy-z xxyml is zero? Where the electric potential is zero? Explain.
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6#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can a particle ever s9 2dy ;viu-l0 sxpq0bmove from a region of low electric potential to one of high pod-s0b s lx0yi9vuq2p;tential and yet have its electric potential energy decrease? Explain.
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7#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Compare the kinetic energy g-(z g+eequg3 bained by a proton $(q=+e)$ to the energy gained by an alpha particle $(q=+2e)$ accelerated by the same voltage $V$.
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8#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If $V\,=\,0$ at a point in space, must $\vec{E}\,=0$ there? If $\vec{E}\,=0$ at some point, must $V\,=\,0$ at that point? Explain. Give examples for each.
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9#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can two equipotential lines 4la2 u .ndesht(pr;w*cross? Explain.
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10#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Draw in a few equipotentv5tm ,4 xn( pac(7/dtwpzc4nwial lines in Fig. 16 – 31b.
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11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What can you say about the electric fial fva 9;zt;:c odh+5neld in a region of space that has the same potential tadznv cf:9th;;o+l a5hroughout?
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12#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A satellite orbits the Earth along a gravitational equipotential line. What shapavjj5n/q v g4y;.;hdy+oax,r e must the or45; .y/vvdj x hyo;nargqj, +abit be?
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13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When dealing with practical3y.paow :n(d lfd8hi ) devices, we often take the ground (the Earth) to be 0 dhl8f(3dwap y .:on)i V. If, instead, we said the ground was how would this affect (a) the potential V, and (b) the electric field E, at other points?
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14#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When a battery is conu*3jc l+ph)9zen zz)pnected to a capacitor, why do the two plates acquire charges of the samezn ph 3l+u p*e)czj9z) magnitude? Will this be true if the two conductors are different sizes or shapes?
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15#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
We have seen that the capacitance C depends on the size, she*kkli4k0gzn0pn)v, ape, and position of the two conductors, as well as on the dielectric constant K. What then did we mean when we said that C isil)g 0z0kevp kk 4n,*n a constant in Eq. 17 – 7?
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16#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much work does the el93et. sgqle,xz-czu 1ectric field do in moving a $-7.7\mu C$ charge from ground to a point whose potential is $+55V$ higher?    $ \times10^{-4 }\,J$

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17#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much work does the elec m7gy nww9xf/(tric field do in moving a proton from a point with a potential f 7wn9/ gmw(xyof $+125V$ to a point where it is $-55V$ Express your answer both in joules and electron volts.
   $ \times10^{-17 }\,J$
   eV

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18#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much kinetic energy will an electron gain (in joules and eV) if it acc o5ce*m:u f(rtelerates through a pot*r( :teoumf5cential difference of 23,000 V in a TV picture tube?
   $ \times10^{-15 }\,J$
   eV

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19#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron acquires 6qa+cff:a z.fnap0)2t*kw jb$7.45 \times10^{ -16}\,J$ of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates, and which plate is at the higher potential?
   V
plate 

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20#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How strong is the electric field between two parallel plate+ha2el7 +zbi do, )lbqx)yi7is 5.8 mm apart if the potential differez7,+ le bdixi+)yh 2al)i 7oqbnce between them is 220 V?    $ \times10^{ 4}\,V/m$

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21#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric field of uixmb j-:oa,zva( b,x8) l a2nhd *mm4$640V/m$ is desired between two parallel plates 11.0 mm apart. How large a voltage should be applied?    V

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22#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field betojo pzy;spv; rcn4;,c07q ln:ween two parallel plates connected to a 45-V battery is $1500V/m$ How far apart are the plates?    m

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23#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field between two parallu6,,dsjjx h8ruk) kf /el plates connected to a 45-V battery is $1500V/m$ How far apart are the plates?    m

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24#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What potential difference is needed5j4-cu qpz( bu to give a helium nucleus $(Q=2e)$ 65.0 keV of kinetic energy?    $ \times10^{4 }\,V$

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25#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two parallel plates, connected to a 200-V power supply, are sepfm, uzg+yfb rs6l48v) l- qddh/rn w9.arated by an air gap. How small can the gap be if the air is not to bd/uv 8 9n6yfz gs .lr+d,fr)mbhq4wl-ecome conducting by exceeding its breakdown value of $E\,=3 \times10^{ 6}\,V/m$?   $ \times10^{-5 }\,m$

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26#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The work done by an ouc 5z7q 4yqo* w(pry+external force to move a $-8.50\mu C$ charge from point a to point b is $15.0 \times10^{ -4}\;J$. If the charge was started from rest and had $ 4.82\times10^{ -4}\;J$ of kinetic energy when it reached point b, what must be the potential difference between a and b?    V

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27#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of an el 5d2j9)jduevx ectron with kinetic energy
(a) 750-eV,    $ \times10^{7 }\;m/s$
(b) 3.2-keV?    $ \times10^{7 }\;m/s$

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28#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of a proton whosw b 6y(7pf7vebe kinetic energy is 3.2 keV?    $ \times10^{5}\,m/s$

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29#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An alpha particle (which is a helium nuclaujf+ur()wr,h,ae m( eus, $Q=+2e$, $m\,=\,6.64\times10^{-27 }\,kg$) is emitted in a radioactive decay with $_{KE}$ = $5.53MeV$ What is its speed?    $ \times10^{7}\,m/s$

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30#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the electric poy4*pyq g7 krn9bs0q *ktential 15.0 cm from a $4.00\mu C$ point charge?    $ \times10^{ 5}\,V$

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31#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point charge Q creates an electric potentiafe(,1pb)va7r 5*qs hqh yy t*6* nfhwal of $+125V$ at a distance of 15 cm. What is Q?    $ \times10^{-9 }\,C$

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32#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $+35\mu C$ point charge is placed 32 cm from an identical $+35\mu C$ charge. How much work would be required to move a $+0.50\mu C$ test charge from a point midway between them to a point 12 cm closer to either of the charges?    J

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33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Draw a conductor in the shape of a football. This cwx4ws f1x 3fg3onductor carries a net negative cw 3x ws4fxgf31harge, $-Q$. Draw in a dozen electric field lines and two equipotential lines.
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34#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) What is the electric potenti3 cjam 8/:jyyral a distance of $ 2.5\times10^{-15 }\,m$ away from a proton?    $ \times10^{ 5}\,V$
(b) What is the electric potential energy of a system that consists of two protons $2.5 \times10^{-15 }\,m$ apart — as might occur inside a typical nucleus?    $ \times10^{ -14}\,J$

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35#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Three point charges are arrangedh) rt:3d9zhadh h4+v h at the corners of a square of side L as shown in Fig. 17–25. What is the potentihz 9h t3vd4:hdrahh)+ al at the fourth corner (point A), taking $V\,=\,0$ at a great distance?
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36#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron starts from rest 32.5e nvgii6-7hu .d)khj8 cm from a fixed point charge with $Q\,=\,-0.125\mu C$. How fast will the electron be moving when it is very far away?    $ \times10^{7 }\,m/s$

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37#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two identical $+9.5\mu C$ point charges are initially 3.5 cm from each other. If they are released at the same instant from rest, how fast will each be moving when they are very far away from each other? Assume they have identical masses of 1.0 mg.    m/s

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38#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges, $3.0\mu C$ and $-2.0\mu C$ are placed 5.0 cm apart on the x axis. At what points along the x axis is
(a) the electric field zero    cm leftof $q_2$
(b) the potential zero? Let $V\,=\,0$ at $r\,=\,\propto$.

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39#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much work must be done to bring three electrons from a great distann )): duhr b .(eli;js-vloif:ce apart ) -f ni;oje:shvirul.)b:d l(to $1.0 \times10^{-10 }\,m$ from one another (at the corners of an equilateral triangle)?    $ \times10^{-18 }\,J$

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40#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider point a which is 72 cmwm7z 3;eadc2 i north of a $-3.8\mu C$ point charge, and point b which is 88 cm west of the charge (Fig. 17–26). Determine
(a) $V_{ba}=V_b-V_a$    V
(b) $\vec{E}_b-\vec{E}_a$ (magnitude and direction).
   V/m
   $^{\circ}\,$


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41#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much voltage must be used to acce.fqdqt a-e) foxe6 o046e,w rqlerate a proton (radius $1.2 \times10^{-15 }\,m$) so that it has sufficient energy to just penetrate a silicon nucleus? A silicon nucleus has a charge of $+14e$, and its radius is about $ 3.6\times10^{-15 }\,m$. Assume the potential is that for point charges.    $ \times10^{6 }\,V$

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42#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two equal but opposite charges are se8 x g,-av;ql oo*yj5ebparated by a distance d, as shown in Fig. 1x*,ayq;8 ve5 l gjobo-7–27. Determine a formula for $V_{BA}\,=\,V_B-V_A$ for points B and A on the line between the charges.
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43#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the Bohr model of the hydrogen atom, an electron orbithur ya+if /)ri)ij2q-i+hh4 s s a proton (the nucleus) in a circular orbia-+sij)) q4+f ihhh r riyui2/t of radius $ 0.53\times10^{-10 }\,m$.
(a) What is the electric potential at the electron’s orbit due to the proton?    V(Round to the nearest integer)
(b) What is the kinetic energy of the electron?
   $ \times10^{ -18}\,J$
   eV
(c) What is the total energy of the electron in its orbit?    $ \times10^{-18 }\,J$ $\approx$    eV(Round to the nearest integer)
(d) What is the ionization energy — that is, the energy required to remove the electron from the atom and take it to $r\,=\,\propto$, at rest? Express the results of parts b, c and d in joules and eV.   $ \times10^{-18 }\,J$    eV(Round to the nearest integer)

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44#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron and a proton are 1ds8cr4/z pmtjnav obwv( x3. s8n5 u8$ 0.53\times10^{ -10}\,m$. apart. What is their dipole moment if they are at rest?    $ \times10^{-30 }\,C\cdot\,m$

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45#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the electric ob74a h:dy ovdh z+g7-potential due to a dipole whose dipole moment is $ 4.8\times10^{-30 }\,C\cdot m$ at a point $1.1 \times10^{ -9}\,m$ away if this point is
(a) along the axis of the dipole nearer the positive charge;    V
(b) 45° above the axis but nearer the positive charge;    V
(c) $45^{\circ}\,$ above the axis but nearer the negative charge.    V

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46#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The dipole moment, considered as a vector, poins bb87eri,hs jgdgfx.1;lu76 ts from the negative to the positive charge. The water molecule, Fig. 17–28, has a dipole moment which can be cons.g,h 8u6res7dbj;i gl7sf 1bxidered as the vector sum of the two dipole moments, $\vec{P}_1$ and $\vec{P}_2$as shown. The distance between each H and the O is about $ 0.96\times10^{ -10}\,m$. The lines joining the center of the O atom with each H atom make an angle of $104^{\circ}\,$, as shown, and the net dipole moment has been measured to be $p\,=\,6.1 \times10^{-30 }\,C\cdot m$ Determine the charge q on each H atom.    $ \times10^{ -20}\,C$


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47#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The two plates of a ca n vm/n:w o w3qemsx-g6yr31/kpacitor hold $+2500\mu C$ and $-2500\mu C$ of charge, respectively, when the potential difference is 850 V. What is the capacitance?    $ \times10^{-6 }\,F$

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48#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The two plates of a capacit7s*x j;mf4,,gzh:cks 4 fbexy or hold $+2500\mu C$ and $-2500\mu C$ of charge, respectively, when the potential difference is 850 V. What is the capacitance?    $ \times10^{-6 }\,F$

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49#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 9500-pF capacitor holds pl v-o a 8d+fo;a4kzbpy4/lxzl 8g)ba3gus and minus charges of $ 16.5\times10^{-8 }\,C$. What is the voltage across the capacitor?    V

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50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The potential difference between two short sections of paralle e jw :kuz13h8u em.,dddc/os,l wire in air is 120oc8: ee1/u,s.dwd ,3zmdj u hk V. They carry equal and opposite charge of magnitude 95 pC. What is the capacitance of the two wires?    $ \times10^{13 }\,F$

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51#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much charge flows from each terminal ofn5u j 5fbe:b:s a 12.0-V battery when it is connected e jbsn 5u5:f:bto a $7.00-\mu F$ capacitor?    $ \times10^{-5 }\,C$

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52#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.20-F capacitor is desired. What area 3/oosza:x rcswsy*7 6gosj: 5 must the plates have if they are to be separsosswjaoyg*5 z6or :xc3 7 s/:ated by a 2.2-mm air gap?    $ \times10^{ 7}\,m^2$

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53#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The charge on a capacitor in vof-82f5lswscreases by $18\mu C$ when the voltage across it increases from 97 V to 121 V. What is the capacitance of the capacitor?    $ \times10^{ -7}\,F$

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54#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric field of et cpq*xju-ek dsmh526m k.0 98;qub p$8.5 \times10^{ 5}\,V/m$ is desired between two parallel plates, each of area $35\,cm^2$ and separated by 2.45 mm of air. What charge must be on each plate?    $ \times10^{ -8}\,C$

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55#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a capacitor has opposite4 * zoqd/1nwrpb1labr7wm u6: $5.2\mu C$ charges on the plates, and an electric field of 2.0 $2.0\,kV/mm$ is desired between the plates, what must each plate’s area be?   $m^2$

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56#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How strong is the electric field betm1m v.c zkg *xi5m49tbp72 ,eg)gmmbuween the plates of a $0.80-\mu F$ air-gap capacitor if they are 2.0 mm apart and each has a charge of $72\mu C$ ?    $ \times10^{4 }\,V/m$

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57#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A capacitor is charged by a 125-V battery (Fig. 17–29a) and then*7aq 7 )xgdtdm is disconnected from the battery. When x7d*agd7)t qmthis capacitor $(C_1)$ is then connected (Fig. 17–29b) to a second (initially uncharged) capacitor, $C_2$, the final voltage on each capacitor is 15 V. What is the value of $C_2$? [Hint: charge is conserved.]    $ \times10^{ -5}\,F$


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58#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $2.50-\mu F$ capacitor is charged to 857 V and a $6.8-\mu F$ capacitor is charged to 652 V. These capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates are connected to each other. What will be the potential difference across each and the charge on each? [Hint: charge is conserved.]
$V_{final}$ $\approx$   V(Round to the nearest integer)
$\begin{array}{l}
Q_{1}\\
\text { initial }
\end{array}$   $ \times10^{-3 }\,C$
$\begin{array}{l}
Q_{2}\\
\text { initial }
\end{array}$   $ \times10^{-3 }\,C$

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59#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitance of two square parallel plates 5.5 cm on a side ) tl6i3ii6)gk:b qicithat are separated by 1.8 mm of3iii) lt g:iki66bqc) paraffin?    $ \times10^{-11 }\,F$

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60#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitance of a pair of circular plates with a radius of 5.- d eg yt6yr(yf g8tgf::xxa110 cm separated by 3.fg16x8a xytg(1r:f y yt:-deg2 mm of mica?    $ \times10^{-10 }\,F$

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61#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3500-pF air-gap capacitor is connected to a 22-V m3.: wys /beql fvqi)3g ix16wbattery. If a piece of mica is placed between the plates, how much charge wiley:wvqwgsx3f3 . l)q 16iibm /l flow from the battery?    $ \times10^{ -7}\,C$

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62#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The electric field between 3 -e9jgem n7drthe plates of a paper-separated $(K=3.75)$ capacitor is $ 8.24\times10^{4 }\,V/m$. The plates are 1.95 mm apart, and the charge on each plate is $0.775\mu C$. Determine the capacitance of this capacitor and the area of each plate.
   $ \times10^{--9 }\,F$
   $m^2$

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63#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  650 V is applied to a 2200-pF c3i +7tl6-ofrvjz0ejd apacitor. How much energy is stored?    $ \times10^{-4 }\,J$

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64#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cardiac defibrillator is used to shock a heart that is bedhpb:),rgr z( id z5h3tt5naq06 uu1uating erratically. A capacitor in this:ad5priuz,6 0h)5n q u trht(ubd 1zg3 device is charged to 5.0 kV and stores 1200 J of energy. What is its capacitance?    $ \times10^{-5 }\,F$

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65#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy is stored by theyhr7b-sbuy 52 electric field between two square plates, 8.0 cm on a side, separated by a 1.5-mm air gap? The charges on the plates are equal andh5 u brb2yys7- opposite and of magnitude $420\mu C$.    J

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66#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A homemade capacitor is assembaw gfivvl d.l87f0h**led by placing two 9-in. pie pans 5 cm apart and co7a8i0* hf wv.lvg*lf dnnecting them to the opposite terminals of a 9-V battery. Estimate
(a) the capacitance,    $ \times10^{-12 }\,F$
(b) the charge on each plate,    $ \times10^{-11 }\,C$
(c) the electric field halfway between the plates,    V/m
(d) the work done by the battery to charge the plates.    $ \times10^{ -10}\,J$
(e) Which of the above values change if a dielectric is inserted?

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67#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A parallel-plate capacitor has fixedvlu0xnt+ rb28 charges $+Q$ and $-Q$ The separation of the plates is then doubled.
(a) By what factor does the energy stored in the electric field change?
(b) How much work must be done in doubling the plate separation from d to 2d? The area of each plate is A.
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68#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
How does the energy stored in a capacitor vx+br yfy8 s81change if (a) the potential difference is doubled, and (b) the charge on each plate is doubled, a8bx y 8fsvry+1s the capacitor remains connected to a battery?
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69#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $2.70-\mu F$ capacitor is charged by a 12.0-V battery. It is disconnected from the battery and then connected to an uncharged $4.00-\mu F$ capacitor (Fig. 17–29). Determine the total stored energy
(a) before the two capacitors are connected,    $ \times10^{-4 }\,J$
(b) after they are connected.    $ \times10^{-5 }\,J$
(c) What is the change in energy?    $ \times10^{-4 }\,J$


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70#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given CRT, electrons are accelerated horizontally by 7.0 kV. gf4o0fhdr9efj.ah w/5dd+4/ : fqmglThey then pass through a uniform electric fie+ ed 4/lg5f/dwf90.r4jfgm q fdhao:hld E for a distance of 2.8 cm, which deflects them upward so they reach the screen top 22 cm away, 11 cm above the center. Estimate the value of E.    $ \times10^{5 }\,V/m$

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71#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electrons are accelerated by 6.0 kV in a CRT. The screen is 30 cm wide and is ib4 4i* tybno;34 cm from the 2.6-cm-long deflection plates. Over what range must the horizontally deflecting electric field vary to sweep the beam fully across th4 nbyioi*t4 b;e screen?    $ \times10^{5 }\,V/m$ to    $ \times10^{5 }\,V/m$

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72#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron starting from rest 7q+micdz6xgs drgh -+ 6vpjuc;752 qgacquires 6.3 keV of KE in moving from point A to point B.pzg +7ig cd6+2 rudqmh7; sv5c6xgj-q
(a) How much KE would a proton acquire, starting from rest at B and moving to point A?    keV
(b) Determine the ratio of their speeds at the end of their respective trajectories.   

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73#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightning flash transfers 4( w iw*e-*hpoo.0 C of charge and 4.2 MJ of energy to the Earth.
(a) Across what potential difference did it travel?    $ \times10^{ 6}\,V$
(b) How much water could this boil and vaporize, starting from room temperature?    kg

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74#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  There is an electric field ccd2a*e;5v h00ej hprf jy 2a; )bvk;lnear the Earth’s surface whose magnitude is about $150\,V/m$ How much energy is stored per cubic meter in this field?    $ \times10^{-7 }\,J/m^3$

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75#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a television picture tube, electrons are a)h lqzk6+h+ ;t6owfsb ccelerated by thousands of volts through a vacuum. If a television s66o; hwqts hzfb)++ klet were laid on its back, would electrons be able to move upward against the force of gravity? What potential difference, acting over a distance of 3.0 cm, would be needed to balance the downward force of gravity so that an electron would remain stationary? Assume that the electric field is uniform.    $ \times10^{ -12}\,V$

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76#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A huge 4.0-F capacitor has enough stored energy to heat 2.5 kg of water from 21cbn i +9s0 i*tuszt)2u$^{\circ}\,C$ to 95$^{\circ}\,C$. What is the potential difference across the plates?    V

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77#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An uncharged capacitor is c e+pj-jj+o00ks; enwionnected to a 24.0-V battery until it is fully charged, after which it is disconnected from the battery. A slab of paraffin is then inserted betsj+epk iow; 0e-j+0j nween the plates. What will now be the voltage between the plates?    V

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78#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Dry air will break down if t qih5 5 ukaznvwfh9j1q;(k+ d:he electric field exceeds $3.0 \times10^{6 }\,V/m$. What amount of charge can be placed on a parallel-plate capacitor if the area of each plate is $56cm^2$?    $ \times10^{-7 }\,C$

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79#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Three charges are at the corners of an +h qf 65 /.uijp fj1emcr9ugf(equilateral triangle (side L) as shown in Fig. 17–30. Determine the potential at the midpoint of each of the sidugmr ecff . u/51(p fi9jh+qj6es.


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80#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $3.4\mu C$ and a $-2.6\mu C$ charge are placed 1.6 cm apart. At what points along the line joining them is
(a) the electric field zero,    cm left of $q_2$
(b) the electric potential zero?

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81#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2600-pF air-gap capacljufa6-f*ite 3+ ek0eitor is connected to a 9.0-V battery. If a piece of Pyrex glass is placed between the plates, howke+u0- e3*e6lffaji t much charge will then flow from the battery?    $ \times10^{-8 }\,C$

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82#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron is accelerated horizontally from rest in a television picture tube ac iu.bt-j a;/w+t2c vby a potential differwvcat2c a ;-.tj+/uibence of 5500 V. It then passes between two horizontal plates 6.5 cm long and 1.3 cm apart that have a potential difference of 250 V (Fig. 17–31). At what angle $\theta$ will the electron be traveling after it passes between the plates?    $^{\circ}\,$


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83#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A capacitor of capacitance 6e t0hx8o3t jypsyo:t5cc1;d $C_1$ carries a charge $Q_0$. It is then connected directly to a second, uncharged, capacitor of capacitance $C_2$, as shown in Fig. 17–32. What charge will each carry now? What will be the potential difference across each?

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84#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To get an idea how big a farad is,1rg 8rljat3 0g suppose you want to make a 1-F air-filled parallel-plate capacitor for a circuit you are building. To make it a reasonable size, suppose you limit the 3rr jlga0tg1 8plate area to What would the gap have to be between the plates? Is this practically achievable?    $ \times10^{-16 }\,m$  

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85#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Near the surface of the Earth there is an electric field of abo eo8 u0hy3uim )*/hkxgut $150\,V/m$ which points downward. Two identical balls with mass $m\,=\,0.540kg$ are dropped from a height of 2.00 m, but one of the balls is positively charged with $q_1$ = $650\mu C$ ,and the second is negatively charged with $q_2$ = $-650\mu C$. Use conservation of energy to determine the difference in the speed of the two balls when they hit the ground. (Neglect air resistance.)    m/s

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86#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power supply for a pulsed nitrogen laser has ts4 1v9 2c9gpa ,eszyva $0.050\mu F$ capacitor with a maximum voltage rating of 30 kV.
(a) Estimate how much energy could be stored in this capacitor.    J
(b) If 12% of this stored electrical energy is converted to light energy in a pulse that is 8.0 microseconds long, what is the power of the laser pulse?    $ \times10^{5 }\,W$

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87#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In lightning storms, the potential c(jx c9u7vrk31g 8 wkkdifference between the Earth and the bottom of the thunderclouds can be as high as 35,000,000 V. The bottoms of the thunderclouds are typically 1500 m above th9gu8 wvc1r kk7x(k3 jce Earth, and can have an area of $110km^2$ Modeling the Earth–cloud system as a huge capacitor, calculate
(a) the capacitance of the Earth–cloud system,    $ \times10^{-7 }\,F$
(b) the charge stored in the “capacitor,”    C(Round to the nearest integer)
(c) the energy stored in the “capacitor.”    $ \times10^{8 }\,J$

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88#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a photocell, ultr*klxath /fg ple7+/ardqsf b 1gcn )+(a33(jnaviolet (UV) light provides enough energy to some electrons in barium metal to eject them from a surface at high speed. See Fig. 17–33. To measure the maximum energy of the electrons, another plate above the barium surface isj r3alq gbg7/1n nd/f3*(aka+) x(cfphtle +s kept at a negative enough potential that the emitted electrons are slowed down and stopped, and return to the barium surface. If the plate voltage is $-3.02V$ (compared to the barium) when the fastest electrons are stopped, what was the speed of these electrons when they were emitted?    $ \times10^{6 }\,m/s$


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89#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point charge is placed 36 cm frogw.pr dy1f y ub)b)a) el19jg3m an identical $+33\mu C$ charge. A $-1.5\mu C$ charge is moved from point a to point b in Fig. 17–34. What is the change in potential energy? $\approx$    J (round to one decimal place)


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90#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A capacitor is made from two 1.1-cm-diameter coins separated by a 0.15-mm-thick 3 g v y7xe hbaju;s785;)ldnfvpiece of pvbgl7 ae nju3fs)xdh8 5;vy;7aper $(K=3.7)$ A 12-V battery is connected to the capacitor. How much charge is on each coin?    $ \times10^{-10 }\,C$

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91#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $+4.5\mu C$ charge is 23 cm to the right of a $-8.2\mu C$ charge. At the midpoint between the two charges,
(a) what are the potential    $ \times10^{ 5}\,V$
(b) the electric field?    $ \times10^{6 }\,V/m$  

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92#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A parallel-plate capacitojw/3i a3w.5 nxpb4wyur with plate area $2.0cm^2$ and air-gap separation 0.50 mm is connected to a 12-V battery, and fully charged. The battery is then disconnected.
(a) What is the charge on the capacitor?    $ \times10^{ -11}\,C$
(b) The plates are now pulled to a separation of 0.75 mm. What is the charge on the capacitor now?    $ \times10^{ -11}\,C$
(c) What is the potential difference across the plates now?    V
(d) How much work was required to pull the plates to their new separation?    $ \times10^{-10 }\,J$

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93#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $2.5-\mu F$ capacitor is fully charged by a 6.0-V battery. The battery is then disconnected. The capacitor is not ideal and the charge slowly leaks out from the plates. The next day, the capacitor has lost half its stored energy. Calculate the amount of charge lost.    $ \times10^{-6 }\,C$

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94#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges are fixc.y6u .7ju xaw:/fozhed 4.0 cm apart from each other. Their charges are $Q_1$=$Q_2$=$5.0\mu C$, and their masses are $m_1=1.5mg$ and $m_2=2.5mg$
(a) If $Q_1$ is released from rest, what will be its speed after a very long time?    m/s
(b) If both charges are released from rest at the same time, what will be the speed of $Q_1$ after a very long time?    m/s

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95#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charges are placed as shown in Fig. 17–35 ;/ynl q tip-5+oz h+wtwith $q_1$=$1.5\mu C$ and $q_2$=$-3.3\mu C$ Find the potential difference between points A and B.    $ \times10^{ 5}\,V$


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