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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. Wh5 d:qkltlpebbqb*h6 x4bwc:) 19xa s2ich of the following statements dqbxqblbblwe:a5t*4162scp9 h :k x )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 ret wd y/;y h(i sl5dpo3cqp/jb1d( 7dpv(m:2mjst. Which of the following statpyh;(3d/ 5pqm2l j1( dbw(mdt cvodipyj: s/7ements 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 )tebwf (d3q, /j xu0hsremains at rest when placed on a vertical wall. Which one of the following terms is most closely associated with the electfq)0w t,ubeh/j3(sx drical phenomenon allowing the balloon to remain on the wall?

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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 cab:w +476 ovs*tucf g m/0z8tpvti0np wrries a conventional electric current out of the paper as shown in the diagram. What is the direction of the asft/: 0unwi*8ts7p z c0tbm46 wvvpo g+sociated 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 have equal magnitude. The diagram to the a3lp8e0.wlno+w .hlgright shows the electric field lines surrounding them. Which of the following statements isple.3ghlo.w+ wa0l8 n 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 rati7h.qyzea/1vp5r/ ;ja -sjfp v o of the charges q1 and q2 vy /.1f/j7zepavpq5j ;r h-sa, where the diagram shown has a representation of the 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 chaspns69z,,e6w bt8 ah a*dg cb6/gsnp0rge is placed at point P in the region near two charges. Which of the following arrows indicates the direction of the force on the positive tszt9 d6 h6e/nb ,w*as0,sgncp8b6pa gest 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 brought near a metal electroscope that7 v juuy5*5;ic1gdm z3vhdyl: 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 the rod isj vl:g*cu 3i;ym yz551u dhd7v 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 charged object is brought near but not in contact with the ost9lgl, tlthn7232i9 u3ycntop of an uncharged gold leaf electroscope. The 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 electrouo yit39th3,slg9tn2l2 7n clscope?

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,g0yn/jcrchkw7r3r+ (az+ 4y1aj +b9vq rq;df causing its foil leaves to separate. When an object is brr abn4f(yj70q;d+ j+v9/ ryawg ch+1rr zk3cq ought near the top plate of the electroscope, the foils separate even 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 conducting sphe xae8g6 r)i mhs+i-l)dres as shown. The sphd+g-iriae)8 )mslh6 xeres 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 rubs a neutral comb through their hair and the comb becomes neof/buo,g44 fggatively charged. Which of the fo4f bfogg,o4/ullowing is the 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 electrically charged glass rod is brought near a neutral 6rhhpc3u)x q*4gbax/hollow metal sphere suspended by an insulating string, the sphere will be attracted to the rod becbh6/au 4rx*)qh3pcx gause:

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 hung on insulating ;iwv+6)mwvo r a m)so;threads attract one another as shown. It is known that a positively charged rod will attractw)v;s a;owmmv6i ro) + ball 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 charged non-conducting spheres on i b smzr6z6dyde3070:ji7 medatfz , 8qnsulating bases areplaced on an air table. Sphere A has a charge +3Q coulombs and sphere B has a charge +Q coulombs. Which of the followina 7,f8bd e6jtd6imyre00 mzqzds3 :7zg correctly illustrates the magnitude and direction of the electrostatic force between the spheres when they are released?

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