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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: 游客未登录开始时间: 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 placedscjq8 one5;t)x kda (wo47 p5v below a compass. When the conventional current in j)tpe5n4sc ad7o5 v(;xwqo8 kthe conductor is from south to north and large, 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 half +k6 dx lor:3r,esyg, ealong the dotted lines shown. None o:+rldkegs,3 e oyx6, rf the pieces 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 filings sprinkled around tybw; 0v 3chwt4hree permanent magnets. Pole R is;w3whbt4 0cyv 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 (g;irjw6p h- ;wpositive) electric current flows from left to right in a wire riw;hw ;-gjp6as 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 xttj a n9twqp6 ,tb88,a horizontal wire from left to right as sho8t6 nbtxaw 8qj,9,ttp wn in the accompanying diagram. 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 repres qcj/;2uwz y 5f,3eayyentation of magnetic fielde wayq3ycj ,z;2 5yu/f lines is inconsistent? The squares in the diagrams below 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 curre)4v ac1oky;m3 qs0 ynrnt directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field assoc4a)qv 3 ymrcs;ky0n1oiated 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.v :yluc b2p2y) mg;ta in space so that the conventional current in the left wiy)lb ga p:. v;cyu22mtre (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 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 cnklzl bg. 8ez3sb8* q3xq u;5yurrent-carrying wires are shown end on in the figure below. The wisy*;gzb3nx8 kb .8l3u5zl qq ere 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 convent r( -.dqfh63gl)tsbewl l*ur.ional electrical current is thhu3r .e*lql.g)rs fbt(6 wl-den run through 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 ik jx1m f )s)ic+j8-ccthrough point P inside the solenoid shown is +ij)81fm) kcjc sxci-
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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