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?作业考试练习?美国物理杯赛(Physics Bowl)?magnet and magnetic field lines

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习题练习：magnet and magnetic field lines

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作者: admin 发布日期: 2024-08-02 21:11 总分: 12分得分: _____________

答题人: 匿名未登录开始时间: 24年07月29日 14:24 切换到: 整卷模式

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.27: A long straight wire conductor is placed below abzz* k( un*qxqo 5n/*g compass. When the conventional current in the conductor is from south to north and large,u5z/*kb( g*xqon * qnz the N pole of the compass:

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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 hlm o95rf0v* j3s ;2gg( lomxpyalf along the dotted lines shown. None of the pieces are r9l0*5fosrpy(; j 3g vmxl2gm ootated. After the cut:

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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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 arounu+pcru f:f r+ 2mdfb(7d three permanent magnets. Pole R is the sambf dr+2 +pum ff7(cr:ue as poles

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.04: If conventional (positive) electric current flows from lc,kb p3ahhup (wx,4t+eft to right in a wire 4 ,h+ w,hpupt(3kxcbaas shown in the diagram, what is the direction of the magnetic field at point P?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.02: An electric current flows through a .vw 5z-xqjrpk+ oxt47 horizontal wire from left to right as shown in the accompanying diagram. Which option best revk pq.x7otr -jx4w+5zpresents the direction of the magnetic field at point P?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.41: From our currv+g6k7 x 1ecp42wmrg(o h9 osdent understanding of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams bel4c or g2mv(e9 6+dxphs71kog wow simply represent regions of space.

A. B. C. D.

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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 planp3beolv)k;w0l 1 fpz ;e of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with t0;zll1wfbopvk ;ep 3 )his wire at the location labeled P?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.33: Two long wireq7uf- :4z7nnf0zn b sfs are fixed in space so that the conventional 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-axis (aside from infinitfnnb7f7u fn -4:szz0qy) 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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.31: Two very long current-carrying wires are shown end on m -b j,qy0gao9in the figure below. The wire q0- g,oyjab9mon
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 wi-c2pd*cl sxm-s 9+b n ojt6ae-re. A conventional electrical current is then run through the coil from left to right as shown. This will cause the North pole of thc*2onm s+ x spd9et-b-aj 6c-le 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 point P inside+dgy o0m)zfe h rlh )m(0t2)6wg2vhqn the solenoid shownrt2 vm6ehog hmg)2)( )ydhn 00wfz q+l is
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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总分:12分及格:7.2分时间:不限时

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