Electric Field and Electric Induction - 题库网 (tiku.one)

?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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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

94.07: A positively /1z(7 *:k0gujnd zno*vttmfel9- ofwcharged conductor attracts a second object. Which of the following statements could be true?zkv zu/7f t09 (g*l:dfn1om *tenwj-o
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 pdf4 svsph,p/ iwfp*05+s do2 and held at rest. Which of thwspf2iphdd /0 54vo s,p+fp*se following 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 *4r5y(4 ljyqa 5k,qfyr8nq yv )f0ir0 -wxcybballoon remains at rest when placed on a vertical wall. Which one of the following terms is most closely associated with the electrical phenomenon allin(f v54yy5qawfr*0 brkyqjy q,84 0 ylc-rx) owing 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 carries a conventional electric currex z h1w4jp;ct4nt out ofx;chz j p41tw4 the paper as shown in the diagram. What is the direction 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 have equal magniioja;dayh r *kx5lo8m7x:r*9qk e+l: tude. The diagram to the right shows the electric field lines surrounding them. Which* l:95a rk;qjy*aik:rhx x+mo8oe l 7d of the following statements 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 charges q1 and l.dlp; bua44s q2 , where the dia asupbdll;.44gram 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( r44 ;thxnpsbn6vzo( charge is placed at point P in the region near two charges. Which of the followionp(4r4n ;zh( v bs6xtng arrows indicates the direction of the force on the 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 0ekf3 )z*s tyd- zokzyko /c74.zn(airod is brought near a metal electroscope that is initially uncharged. As shown in the figure, the ry az-znek*dc /7sk (4z) yo3k.zift0ood 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 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 charged object is brought near but not in contact with the t1o5.kxj hz /y jbuc4m4op 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 th x.ojk4bmz5 j4uhc 1/ye 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 nfp z6qnx7) y;a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of )zp7yn6 ;nfqxthe 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 spheres as smqkat 2 cv+im-6vnf, 3hown. The spheres have no net charge. Region II has th ian3-vqm ,6 f2+vktmce 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 comqvrt ),i2y- bjb becomes negatively charged. Which of the fo)rv j2itb,-qy llowing 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 cee7.ut8,b mi a neutral hollow metal sphere suspended by an insulating string, the sphere will be attracted t8cm b7. t,ueieo 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 hu6v9i6pal; pkqo2r-:s 4; + scvtcm rfang on insulating threads attract one another as shown. It is known that a positively charged rod will attf pqsl2i64-+tr6srao 9mvacc; :vkp ;ract 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-conducc.zv a jl;(27+i :eplit 0skbhting 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 elelp is+ez kvj. :h(al20 bti;c7ctrostatic force between the spheres when they are released?

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