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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 ysgp 0yyh+.s,eton4h5a r4s.wire conductor is placed below a compass. When the conventional current in the conductor is from south to north and ltr,ss+.5gn shyoy440 pe ha.yarge, 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 aum+- ,gu98;hfdu xf l(fc8qldlong the dotted lines shown. None of the pieces are rotated. Afdhg9,f lq-mf8xf uc ld(u8+;uter 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 iro:k e2xobge( i4n filings sprinkled around three permanent e(4bx ek :2giomagnets. 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 current bmv3 )9sdr(sf bdh/ t;flows from left to right in a hr / m 9b;3dt)sdf(vbswire as 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 horizontal wire from left to rim0i2iuabv/ md*d:b t ;ght as shown in the acco di0/ba tiu*m md:b;v2mpanying 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 currea h5lcu7n/ +ehf x w6:wq.flh)gocb;1 nt understanding of physics, which representation of magnetic field lines is inconsistexfhnwa7coh.b;)+f /uhlgecw:l15 6 qnt? 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 currmuqb 3x2i:w oz ;fc12w0wk,vient 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 associated with this wire at the location labeled 0,boiw u2 c 1wq kwm;fz3:2vixP?

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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 arep2ud32 gzc iu/ 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 tu2iu 3c 2d/gpzhere 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 are shown rc 8ku3ef 3o85w6gclun:w(vph op7/uend on in the figure below. The wire on:wp 7/ou63 8r uwf 5h(cvknu3c lpgeo8
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 el sfwcp1z lz-c (6/we2kectrical current is then run through the coil from left to right as shownzwecfwp-klsc 1 /z6 2(. 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 g,n;(a ibknc(dd r y+lc5 .m5tline passing through point P inside the solenoid shown g(b;yna5l( 5 .tm dcrkcd ,in+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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