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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 a compxi1 6xm bo(y0sass. When the conventional current in the conductor is from south to north and large, the N pole ombo(ix6sx y10f 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 halfzxnz(4fysv95q 2au 7z along the dotted lines shown. None of the piec( zz9452 aqszxv y7ufnes are rotated. 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 ficswal26p+ t f5lings sprinkled around three permanenc wat+2l5fp 6st magnets. Pole R is the same 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 cs5qah*+sch xy 0tb * h;w*t-yay mo(k4urrent flows from left to right in a wire as shown in the diagram, what is the direction 4-0 hbcsth5;wa+k(yyha q*m s*toy*xof 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 horizontal wire4 zjn 2jj4q5-jd1dzla-9t b gb from left to right as shown in the accompanying diagr 4z ga49 -ljjd5d-b1 tjqjnz2bam. Which option best represents 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 current understanding of physics, which representatd c, g,a))ukcf ,lix7kion of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regioka7)clig d,x c,)u,fkns 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 directed7xmg:otu8p t n5xpfe1et//n8z: my) b into the plane of the page a tt )tf87xpnmbn1 /z8 u:e y:5omxep/gs 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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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 sok;le4 zadf.4z that the conventional current in the left wire (2 A) comes out of the pfld;a.e4k4z z lane 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 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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.31: Two very long current-carrying wires a 2zkazh82ug71*hr vcyks tb j1z77z9qre shown end on in the figure below. The wire on h aszg9q2zr k1b7z 7* jt21v7 c8khyuz
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 electrical curre8s +*5 cg8sbpx3hytzyb jq :e9q*v2efnt is then run through the coil from left to right as shown. This will cause the North pole of the compass8y3:ey 8qgph ctbq *j+vzss*9xb 5 2ef 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 f :ln(hxx 6gx,through point P inside the solenoid shown is:l6xh,g (f nxx
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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