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?作业考试练习?美国物理杯赛(Physics Bowl)?Electric Field and Electric Induction

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习题练习：Electric Field and Electric Induction

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答题人: 匿名未登录开始时间: 24年08月22日 10:29 切换到: 整卷模式

1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

94.07: A positively charged conductor attracts a second object. Which of the fb2b vd:fe)e/w ollowin ef2bd)bw/e: vg statements could be true?
I. The second object is a conductor with negative net charge.
II. The second object is a conductor with zero net charge.
III. The second object is an insulator with zero net charge.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.07: An amber rod is given a net negative charge and held at rest. Which o+tcc z56 b,emkf the foztke c6+mbc,5llowing statements is true?

A. The amber rod is surrounded only by a magnetic field that circles the rod.

B. The amber rod is surrounded only by an electric field that is directed out from the rod.

C. The amber rod is surrounded only by an electric field that is directed into the rod.

D. The amber rod is surrounded by both a magnetic field that circles the rod and an electric field that is directed out from the rod.

E. The amber rod is surrounded by both a magnetic field that circles the rod and an electric field that is directed into the rod.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

15.08: A negatively charged balloon remains at rest when placed on a vertical c wxx ;jpwj-0f c7/wcbxh//p7wall. Which one of the following terms is most closely associated with the electrical phenomenon allowing the balloon to remain on the wall?wfwxx7 j 70x-c;/ wph/jcp/bc

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.37: A long straight wire viewed end on carries a conventional electric curren1pxb 0kavu6 cl5:.sgymb**ppzq ; 3ww t out of the paper as shown in the diagram. What is the directi*aylw p pv15 6zkx*qgb0bsupcmw ;. 3:on of the associated electric field at point P?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.05: Point charges 1 and 2 wcsmt :zpn4;( i7:t1gq; fbbt have equal magnitude. The diagram to the right shows the electric field lines surrounding them. Which of the following statementsmc7 (gbp;ts4 :bz1qni w;f:t t is true?

A. Charge 1 is positive, charge 2 is negative.

B. Charge 1 is negative, charge 2 is positive.

C. Both charges 1 and 2 are positive.

D. Both charges 1 and 2 are negative.

E. Both charges 1 and 2 have the same sign, but it is impossible to tell which.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.26: For the diagram shown below, what is the ratio of the chari c1k u9se3v okyg*9jiam4/ l)5z;pog ges q1 and q2 , where the diagram shown has a representation of the)94ze/a gmk5kvcijo;9i 1lo su3 y *gp field lines in the space near the charges.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.17: A small positive test charge is placed at point P in the *35x, 8it;eg+ib;h iiyd 6 xmb4qxcx zregion near two charges. Which of the following arrows indicates the direction of the force on th*hy6z g;ii 35itx xbxq8i,cb4d em+ x;e positive test charge?

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

11.05: A positively charged rod is broug )rb1n qlyib;x+w0)ywht near a metal electroscope that is initially uncharged. As shown in the figure, the rod does not touch the electroscope. There is no charge transfer between the electroscope and rod, but the leaves of the electroscope move apart from each other when )1r bx bi;w)yw nlyq+0the rod is brought near the top of the electroscope. Which one of the following choices is the best explanation for this phenomenon?

A. Protons are repelled by the rod into the leaves of the electroscope.

B. Electrons are attracted out of the leaves of the electroscope toward the rod.

C. Protons are repelled into the leaves of the electroscope and electrons are attracted out of the leaves of the electroscope.

D. Positively charged electrons are repelled by the rod into the leaves of the electroscope.

E. Positively charged electrons are repelled into the leaves of the electroscope and regular electrons are attracted out of the leaves of the electroscope.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.15: A positively chn(*0pip( f 6m,xx xg zh(u+izoarged object is brought near but not in contact with the top of an uncharged gold leaf electroscope. Tzif(zg0ux +o(, h6px*m(i npxhe experimenter then briefly touches the electroscope with a finger. The finger is removed, followed by the removal of the positively charged object. What happens to the leaves of the electroscope when a negative charge is now brought near but not in contact with the top of the electroscope?

A. they remain uncharged

B. they move farther apart

C. they move closer together

D. they remain positively charged but unmoved

E. they remain negatively charged but unmoved

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.09: An electroscope is given a positive charge, causing its foil leavey 0.kfklj m;7ps to separate. When an object is brought near the top plate of the electroscope, the foils separate ev7 .0jkflpkm; yen further. We could conclude

A. that the object is positively charged.

B. that the object is electrically neutral.

C. that the object is negatively charged.

D. only that the object is charged.

E. only that the object is uncharged.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.06: A charged rod is placed between two insulated conductinj(.c ik,;xf gng spheres as shown. Tc (.gx nji,;kfhe spheres have no net charge. Region II has the same polarity as Region

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.23: A person rubsbqr l)-na0vg fk7., bvzi/+op a neutral comb through their hair and the comb becomes negatively charged. Which of the following is ta, o70/f)bib gz vvpkqn-r.l+he best explanation for this phenomenon?

A. The hair gains protons from the comb.

B. The hair gains protons from the comb while giving electrons to the comb.

C. The hair loses electrons to the comb.

D. The comb loses protons to the person’shand holding the comb.

E. The comb loses protons to the person’shand while also gaining electrons from the hair.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.09: When a positive electruuxuv;me v47f* 7.i viically charged glass rod is brought near a neutral hollow metal sphere suspended by an insulati7.i v7mufe *vv4uxiu; ng string, the sphere will be attracted to the rod because:

A. the rod is much larger than the sphere

B. the rod removes electron from the sphere

C. the electric charge produces a magnetic field to attract the sphere

D. the charge on the rod causes a separation of charge in the sphere

E. some of the protons from the rod have been given to the sphere

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.24: Two small hollow metal spheres h9ct*7jlb)k f09iu 4lx rdmqy;ung on insulating threads attract one another as shown. It is known that a positively charged rod will attract 9x0d) rbyucfk; *ljt97qi4lmball A.
I. Ball A has a positive charge
II. Ball B has a negative charge
III. Ball A and Ball B have opposite charges
Which of the above can be correctly concluded about the charge on the balls?

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.36: Two uniformly chak:.bd/aigcdmg zy6 1/36wdt+n c :en vrged non-conducting spheres on insulating bases areplaced on an air table. Sphere A has a charge +3Q coulombs and sphere B has a charge +Q coulombs. Which of the following correctly illustrates the magnitude and direction of the electrostatic force between the spheremy6+c:d wd/ d1kg c nvt3:i6bna/g z.es when they are released?

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