Electric Field and Electric Induction - 无忧得胜-网上国际课程 (5edu.win)

?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: 游客未登录开始时间: 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 foic/ ys-xd gx41llowing statements couldc 4s-1xd gxy/i 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 aq :up/5ipxcum16 p6 odnd held at rest. Which of the following sd co/ui6:qx1 56ppp umtatements 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 onrdbilw+1o78j9 3a qo-rphj 1 j a vertical wall. Which one of the following terms is most closely associated with the electrical phenomenon allowing the balloon to remain on the waljdohb ojrap +rq- 811i3w97jll?

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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 conven vxr x1ry,uk,/vp+m4ctional electric current out of the paper as shown in the diagram. W ryx4prx,vkc,/+ mv u1hat 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 magnitf66y4 jkm3)gt wqzm0oude. The diagram to the right shows the electric field lines surrounding them. Whic 6zkm6wmt 340gyofq )jh 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 belowwu(c iw,)tlxs 5 ow-)vn6 9 jxueu6x4v, what is the ratio of the charges q1 and q2 , where the diagram shown has a representatoev )- j4x)wwitx6nx9scwuuvl,u ( 65ion 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 g ud2gq)5u:jccharge is placed at point P in the region near two charges. )uq5uggc2 dj : Which of the following 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 rod is brought near a metal electroscophx4hb hd6;2sdepgw(aj5 t7/ ae 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 oth7eha/xsd tpwh2 5dbg6; h4j(aer 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 nearp30 2hl nfnzb: but not in contact with the top 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 electroscope? f:nz l3b2h0 np

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 p r- o iqe3fb+2j5ie/y t jrwae,eau/tw+(;) kmositive charge, causing its foil leaves to separate. When an object is brought near tfaet i5(jku/-w3y + a/m ribe+;tej)w,er2oqhe 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 spheres+ 6s6 k16 8 op h-zmpnow4psxmp1zo2uw as shown. The spheres have no 6 6pmpzzu2-wsop 1m+khs wxo8461ponnet 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 neutrrtctb 0 7fwuwi.,( n5kal comb through their hair and the comb becomes negatively charged. tn5wi.(f ucr 7 0tb,kwWhich of the following 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 huly/m bv,z(h v/lo 2-neutral hollow metal sphere suspended bl/lmb2hv/ zu oh yv,-(y an insulating 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 hung on insulating thre0q h4bbrld.tcd )) j)mads attract one another as shown. It is known that a positively charged ro dhtb).r b)jm0q4 dlc)d will attract 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 insulating bases arh- dljk3 1yzx.eplaced 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 betwee 3y1.-ldhjkzxn the spheres when they are released?

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