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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 straigh (l.zhk3wm.f vt wire conductor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of f.hw.mkz(3v l 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 along the dotted lin* p j*5e(d1 dpd /ld.bknj-nh )lrh-bces shown. None of the pipd5h1/l d-n (dk-)epndh * bb*cr.jl jeces 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 au51hj2vq43 8( vi sd;bufky laround three permanent magnets. Pole R is the same as 2uusvalvjb ;k y i3q(h8 d154fpoles

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.04: If conventionanflpxv wv 7uu5*h, qkg91i .,zg98iuql (positive) electric current flows from left to right in a wire as shown in the diagram, what is the direcnlfkgg xvu,zui98.v i1q*7u9,wqp h5tion 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 rid t ajdfi,ix x8)a8byw(dk v(+pl7- 4yn5ci(eght as shown in the accompanying diagram. Which option best represents the di iax 4 5yydwnx+dlc jbk(ip(7 )d(i,t-8f8averection 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 physi7j5tzuscx5pf+ s7aq:(c n l8xcs, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply ptsz57nu+ (c j5sl7cxf:aq 8xrepresent 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 conve oi3msov/ou t+6q9g pc1f j9d5ntional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best iop6odq51 3ucomijt g+ sf9/9vndicates 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 so that the e,x;,no 5qrv r .,cpcpi5:udhm7w )yx 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 pagedh np.)pxcwrxy 7o:cm, ri5ev;5, uq, . 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 curova e/3f76gwlvrs 1 :a0txnm4 rent-carrying wires are shown end on in the figure below.0/ 47or1aslma: 3w gexf6vnvt The 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 conventionalun,n o )ytt7q7 electrical current is then run through the coil from left to right as shown. This will cause the North pole of the co tt7)uqo,7yn nmpass 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 insidpmpnf5js 2k)d 2ew- d.e the solenoid shown pp.2wmsd 5fnj2 -e)kdis
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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