magnet and magnetic field lines - 无忧得胜-网上国际课程 (5edu.win)

1#

96.27: A long straight wire conductor is placed below a compass. When the convrl3 e5a6gtya3cvl :1ientional current in tg3 cy:t r6a5l1vlea3ihe conductor is from south to north and large, the N pole of the compass:

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.17:Two bar magnets are to be cut in half along the dotted lt,jexzlag 6 jvf)+*) jines shown. None of the pieces are rotated. After the cux v+tl,g6ef )jzjja)* t:

A. None of the halves will attract any other.

B. The two halves of each magnet will attract each other.

C. The two halves of each magnet will repel each other.

D. The two halves of the top magnet will repel, the two halves of the bottom magnet will attract.

E. The two halves of the top magnet will attract, the two halves of the bottom magnet will repel.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.21: The diagram to the right depicts iron filings sprinkled around7-ldsls fa+;meu6y1; dv5 wb 1b(l kyo three permanent magnets. Pole R is the same as poles;7l5delmyo-yf l1+ da 6(bsbs1kvuw;

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.04: If conventional (positive) electric current flows fro5 ym, cwsz(co/3k/ v +hprt4rym left to right in a wire as shown in the diagram, what is the direction of the /crt/cr+vsz mkyw, yh(o 53p4magnetic 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

97.02: An electric current flows through a horizontal wire frogao*lkqm aqyyx-*.ssdkt1y 359l )y1 .l+ f jnm left to right as shown in the accom.+ x5a3tqn) yky* yoq1j-l*9d lkl1g ysmsf.a panying diagram. Which option best represents the direction of the magnetic field at point P?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.41: From our current understanding of phyo:x/-)xsrfc csics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below six-:fx) ccs /ormply represent regions of space.

A. B. C. D.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.28: A long straight wire has a conventional current directed into the plt9ol v,bk/ hncc (k68zane of the p/k zc6vb n8,(cto9khl age as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wire at the location labeled P?

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.33: Two long wires are fixed in space so that the conv)c-)lilr67n e4xa o1gqala (aentional current in the left wire (2 A) comes out of the plane of the page and the conventional current in the right wire (3 A) goes into the plane of the page. In which Region(s) is there a place on the x-ax4a 7c1g(x ))elr6a-qlnao ail is (aside from infinity) at which the magnetic field is equal to zero from these currents?

A. Only in Region I

B. In both Regions I and II

C. Only in Region II

D. In both Regions I and III

E. In both Regions II and IIID. electric field strength divided by magnetic field strength

F. charge divided by mass

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.31: Two very long current-ca:ra5 y7+cpk gkrrying wires are shown end on in the figure below. T g+kr5ka 7p:cyhe wire on
the left has a 4A current going into of the plane of the paper and the wire on the right has a 3A
current coming out of the paper. Disregarding the case of x → ±∞, in which region(s) could the
magnetic field from these two wires add to zero on the x-axis.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.31: A compass is placed near a coil of wire. A conventional electrica,y13 i sj+sghsl current is then run through ysshs+1,i g3j the coil from left to right as shown. This will cause the North pole of the compass to:

A. point toward the left

B. point toward the right

C. point toward the bottom of the paper

D. not move since the magnetic field of the coil is into the paper

E. not move since the magnetic field of the coil is out of the paper

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.19: The magnetic field line passing through ya )ak1 j7cuj17,jfbcpoint P inside the solenoid shown is ab 1cjjc17k ,fa juy7)
directed

A. to the right.

B. to the left.

C. downward the bottom of the page.

D. upward toward the top of the page.

E. in no direction since the magnetic field is zero.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.36:When one compute the square root of the ratio of the permeability of free space to the
permittivity of free space, one obtains $\sqrt{\frac{\mu_0}{\varepsilon_0}}$= 377. What is the unit of this quantity?

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