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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, doegfe*(ak3hg mty m0r7si*0*cts this mean that no work is done in m 3r*e*0*a0i gmfh(cmtgt7 sykoving a test charge from one point to the other? Does this imply that 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 s d43ko2 rk+ybbphe6) in an electric field, will it move toward a region of higher potential or lower potential? What about a positive charge? How does the potential energy of the charge chan6p4+ 3kesrb2byd) okhge 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 (a) betwee,vzz/ jyz/7 dzuoe9-y n electric potential and electric field, (b) between electric potential and electric potential enuy/z/zy9d z eoj v,z-7ergy.
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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, 0.10 V. How oer3,+qg k2s b n 6aci6+d1eogmuch greater would its final speed be if it is accelerer on6,b1+gg6+ak dieoqs3 2 cated with four times as much voltage? 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 chargn 5e)cx0jt yi2m)0s1 g,rk zpees where the electric field is zero? k ,tpj1r y2mz x0ci)seng)05e 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 move from a region of low electric potential to one of highxe7e lng x mzz1n/6bzk;p0bl925 ka5h potential and yet have its electricepxba65 mzk zkl1 5ngh97bn; xz l02/e 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 gained by a 4j8qbf irsc0*k2,(i tovxjb3proton $(q=+e)$ 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 c/ ql g,duizudy( 98bx;)3 dkaour8zj;ross? 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 equipotential lines in Fig. (:i tzvf6d+zcon1kb(bt 0e (i16 – 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 elect,ea9p )a wsn5ppk;xn/uf3j hux.v w2:ric field in a region of space that has the same potential t 5 p:9usxaxv jpp)hw ,ke2.3;nnf u/awhroughout?
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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 gravitez-asj k e9j7p.*u wjf,ql .i)ational equipotential line. What shape-).w z eaj uliefj*9q7.skpj, must the orbit 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 practical devices, we ;5fk:eu2nsw t(n)rk j often take the ground (the Earth) to be 0 V. If, instead, we said the ground was how would thijk:we5 rt nf;sun)2 k(s 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 co4 u37kltnt6 u8 cd:jpsnnected to a capacitor, why do the two plates acquire charges of the same magnitude? Will this be true if the two conductors are differen3tsul4k n 7dp6:tj c8ut 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, shape, and positi 9ks4prgzbt 04:k jr4pon of the two conductors, as well as on the dielectric04p4 s j :ptkg4zkrrb9 constant K. What then did we mean when we said that C is 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 1ecrhi9ieja9jk8/bvo+fih1) nai/ - electric 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 electric field dvc jh9:a85xy +gh nr, e*jmp;ro in moving a proton from a point with a potent8n9 cx,+ hpr*5vaejrj;hy mg:ial of $+125V$ 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 h ajri(r40md7ol00 bhwill an electron gain (in joules and eV) if it accelerates through a potential difference of 23,000 V i47hlij0adb oh r00rm(n 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 lona0pxy0 r7t,.swnf(q )cg, $7.45 \times10^{ -16}\,J$ 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 i1ws8,cg uz4cow9 oc c. 43rxlfield between two parallel plates 5.8 mm apart if the potentigxl41zcr3w uwc49o,c .ios8c al difference 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 tv*+)uqf h.f;r2vs0im xi0xa $640V/m$ 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 between two parallel plates connected to 0cazt+z g uzys 81d1uo*3g- iqs5 g9wra 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 parallel plates csdl -iuf 24p4xx4lhq7onnected 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 nee orkw qv0auh;ck 5+hb(b()(hided 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 cc,lr )p.7ss d.g;axfpower supply, are separated by an air gap. How small can the gap be if the air is not to become conducting by exceedin ;c )sgc.dsx fa.r,l7pg 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 external ffnvhw15avf)e;d xn, +orce 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 ap +3vgto 6t6nzn electron 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 whose kinetic energy is 3.2 z80s:g-o3k p snv8p*nq fhc5ukeV?    $ \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 nucq 5zuc2otab(xp s,, wbqwe; +/leus, $Q=+2e$, $m\,=\,6.64\times10^{-27 }\,kg$) 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 potential 15.0 cm f2zsq-7m;xmd olcv3q 0pm+n, jrom 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 electrv d qmcq g5x1z9lv42 o;.heth2ic potential 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 conductoh w:f:x p 2+d:xgp2 gd)exv7t(fooax)r carries a net negative charg2aexgxohvo):)(2:gfd fxdpt+p :x7w e, $-Q$. 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 potenti 8wn fxr79t-aial 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 arranged at the corners of a squar* lyoc, c4if(ke of side L as shown in Fig. 17–25. What is the poten k iy,c(l4co*ftial 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 fromq1a :y5vk)t*,di4( 6h7 yecla1zy1yx tbwacz rest 32.5 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 distance apepo*:fkk0no7+,0ki h s6nitu art to n0,*kk t:e7+nshkopo6 fu0ii$1.0 \times10^{-10 }\,m$ 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 iroj)*)1/dns3y gjjn 7h 7fizl s 72 cm 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 bew z(hthy;j 9,h used to accelerate 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 separated by a distance d, as 2zk8rmsvbd tf * *+fz:,pch;jshown in Fig. 17 fhvp*zbr*k;d:2 + m8cfztsj,–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 orbits az,x8ik.izy*f+-y jip proton (the nucleus) in a circular orbfyi.8i +,zp kzx*yi-jit 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 pro40/ x hfqiyv:ay5l tz4ik6,is4z nxp9c4tu: o ton are $ 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 potential due to a uzx4/2 usu0jmyhpgo8/,x1,v1v e; y0 oo ulstdipole 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 vecte4d30gbl by 0ior, points from the negative to the positive charge. The water molecule, Fig. 17–28, has a dipole moment whichbb0y 3lge4i0d can be considered 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 catyr7n6zf uu2 g *co*u8pacitor 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 capacitor hold .zj/r3ex0k td $+2500\mu C$ 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 plus and min or* sgjcaz:w )z +pldh)se7+;us 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 parallel wire ;.cv+q9q xc.8qo v qamin air is 120 V. They carry equal and opposite chargc+.vqq q ;vxo9m qa8.ce 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 tet; ms/b7l d2;g(zss j86po vznrminal of a 12.0-V battery when it is connected;lpssmg ;t(z 726zd bonv8s/j to 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 must the plates have if they are to bea2*1nfhxnko/f/ubq c 44 8mxh separated by a 2.2hkx4q * cnf b hu//2mfa81ox4n-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 increeo 1+py*d:iemb+dk w 5ases 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 ofu*( gdckec+ x6 $8.5 \times10^{ 5}\,V/m$ 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 oppob v z7nufc6 8ud4e.dw/site $5.2\mu C$ 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 between the plateyf1jneph4;vmdk 0-6q3 s m)e ys 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 w(-dbl c)9k vs:pt(ie (Fig. 17–29a) and then is disconnected from the ba()k9 cb(s ewi vpt-:ldttery. When this 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 tnu(t; 8s amtc,yv(-av wo square parallel plates 5.5 cm on a side that are septu,8a;yc( s(-nvavtm arated by 1.8 mm of 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 plat-l:tow; awry ,es with a radius of 5.0 cm separated by 3.2 mm ooalyr: ww,t- ;f 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 capacita3mpi2p9r4 v paxcaqpzm1k84+o) s6i or is connected to a 22-V battery. If a piece of mica is placed between the plates, how much qziima6r4)a kpa3 m48ov9p 1 +xs2pcpcharge will 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 th(v d8rp dgvp ;z-,fv,ie 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 capacitor. How much g(43z2 arwg3sd-tr qz .7rpll 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 sho6 r;pk4eg+klvlr1f6m ck a heart that is beating erratically. A capacitor in this6+r ;l pve4lkfrm 6kg1 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 the electric f t. anbwehq(pcim)+ ./ield between two square plates, 8.0 cm on a sidh. ia(+tp. )/wcnmbeqe, separated by a 1.5-mm air gap? The charges on the plates are equal and 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 at m ymjy;j5f,iax+)v( l9.l;cymmj -pssembled by placing two 9-in. pie pans 5 cm apart and connecting them to the ojvj ;-limplyy(5 m+.mjf;ym,tx c) a 9pposite 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 fixed char xkmkghoy 64x 7,/w, (.amzfcrges $+Q$ 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 change if (a) the potential diff kpoo2fmtc615 n4ra0xerence is doubled, and (b) the charge on each plate is doubled, as the capacitor remains conntf kc5ap 4m1x0nr oo26ected 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, eleck+48* oo wxlq jwlc c*f4waon-- z,:ubtrons are accelerated horizontally by 7.0 kV. They then pass through a uniform electric field E for a distance of 2.8 cm, which de4*zw4-wf ob*ca uoql :w k8o-+x c,jnlflects 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 n,ndp zlnz cd4fx +plphz8up14 (5+b,a CRT. The screen is 30 cm wide and is 34 5n dh, c4nl1d+8 lbz p(zf pux+4,pnpzcm from the 2.6-cm-long deflection plates. Over what range must the horizontally deflecting electric field vary to sweep the beam fully across the 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 acquires 6.3 keV of KE in moving froeee9y3lkb6 -jhlp1f sqxue,*hx0 1 v90kzsv1m point A to p0q hu3bhxj1e*evky 109k1 xvlfe6 s9sezl p-, oint B.
(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 tra3 m/luu k+1cy /nvs/7(soem yfnsfers 4.0 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 near the Earth’s surface whose magw,9x:yhresm2 yr tc)2-x swg-b oy30onitude 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 accelerated b r)tnvzi7 q q(hg pfr7vzr;;,8e(lhjk ;+lmb6y thousands of volts through a vacuum. If a television set were laid on its back, would electrons be able to move upward against the force of gravity? What potential difference, ab;7vq vph7 z hf;r8( )ilrjmg; ln,tk erqz(6+cting 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 2m+no1 :z ,miqa1$^{\circ}\,C$ 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 connected to a 24uh*mevgdpj )d-nfwgt) p8- 1*.0-V battery until it is fully charged, after which it is disconnected from the battery. A slab of paraffin is then in*vtd1wegn g) phf8)-jm*dpu -serted between 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 the electric fielt.f ip4l5uj8)1y*s5 bonmpaob . tvl/d 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 equilateral triangle (side L) as shown ibrxxzibm*4) y wsn 8:.n Fig. 17–30. Determine the potentiaxy xwmr4b:8z s.in*b)l at the midpoint of each of the sides.


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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 capacitor is hciw)i5h43 ssqmd. 4z connected to a 9.0-V battery. If a piece of Pyrex glass is placed between the plates, how much charge will then flow fro cq d.im5hs4)zhw4i s3m 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 pidq5 m*.gnj wvl8s*djf7v; h0 icture tube by j5s*m h fd8d.l0 7g*vwjniv;qa potential difference 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 capaci0 7vb yit8yt5,8odsxctance $C_1$ 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 d)dj6 kf.tc1o. xdj)jis, 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 plate area to What would the gap have to be between the plates? Is this practicj)cxt .dk. 1jf d6)dojally 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 isgc rbx 5 u-:h0+cecahh-6l+ ck an electric field of about $150\,V/m$ 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 y0pf v7yd i7x5txnf1, has a $0.050\mu F$ 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 difference between the Earth ssy bez)ekw8;1g1wc5 and the bottom of the thundercloue gw;ezc5kywbss ) 811ds can be as high as 35,000,000 V. The bottoms of the thunderclouds are typically 1500 m above the 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, ultraviolet (UV) light provides enough ewz,,,1a:ct 7iorbnta nergy 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 is kept at a negative enough potential that the emitted ectn, 1oaat7zi,, w: rblectrons 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 placecvw/e-- +-5 ri(5sqrgoo1c;ucpk wj gd 36 cm from 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-thicg (*2zps s2kpnk piece of 2s(p2pnk sg z*paper $(K=3.7)$ 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 capa5ts6bc+up x4p wp 0yz h8s+k.p(c6 jgccitor 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 fixed 4.0 cm apd9s5y0m c z2e6n87:kl myrjb eart 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 show4ke9vlq62ujvcw , e17/ e nbdwn in Fig. 17–35 with $q_1$=$1.5\mu C$ and $q_2$=$-3.3\mu C$ Find the potential difference between points A and B.    $ \times10^{ 5}\,V$


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