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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 placex./z klcosg ;(d below a compass. When the conventional current in the conductor is from south to north and large, thegzk(/ ;xso.l c 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 along /dki gtts- :rs w44-(nv:ksipthe dotted lines shown. None of the pieces are ro/pvsg tntk (ri is- swd44-::ktated. 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 rii2* . p; 61fbrk n6oss(swmkujght depicts iron filings sprinkled around three permanent magnets. Pole rmbn6s (;p2ikfwj. 6ss1 o* kuR 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) electrif q ml/l7ctbx6cw *l86c current flows from left to right in a wire as shown in the diagram, what is the directiont7* lfx wclb8m 66q/lc 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 f ,iwigfbw,hgy:ek0bq2d0l ;) lows through a horizontal wire from left to right as shown in the accompanying diagram. Which option best represent bwyw00,eg: ,kgdhi)b 2;qifl s 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 under0(d 44afdgne8b4we zj standing of physics, which representation of magnetic field lines i4(nda4e0dw gz8e4 bfjs 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 conv h2q;m :e3jwqbentional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnet3hq q2be;w:j mic 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 conventional currqm09mpq j -t7lxn.6xpent 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 ml qmt x-.qxnjp0967p 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 arnvf x,q,s7cs:mx0b(dp j,mk4 l:9e pte shown end on in the figure below.k(0,cj:x,vmt:7fsdp x ql p9n meb ,s4 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 placedeuw6( i,xo16 pe)bimhhwww39 near a coil of wire. A conventional electrical current is then run through tpbe,6w1 we9wu63)xhw( omih i he 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 through point P inside t2ms5r oi7 unk:he solenoid shown is 75s no:irk 2um
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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