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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 placed below a compassdeiwi 8gvchj011 , 0iw. When the conventional current in the conductor is from south to north and large, the N pole of the compass: v,ci g0dw8eh011 i wij

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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 dotm po.ligv2x+)l1 ;jgited lines shown. None of the pieces are rotated. After the c.xgml+v oplg1 i); ji2ut:

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 r8ah g)j)pl z7hb/ovdi 6z8p3hight depicts iron filings sprinkled around three permanent magnets. Pole R is the same as)jz 3bd)8p8vz/lhah6 poh ig7 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) ele7(c 8c/5guw mjyfuon;ctric current flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic gomu cc 85f(jnu/;7wyfield 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 flu ;6loi md0dg,ows through a horizontal wire from left to right as shown in the accompanying diagram. Which option best representdg6l,0;iud m os 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 phy- jah(f9. 5xbv,gvohtsics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions ofv vj hth(g9bx.5a-,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 directed intk.os/ r/ z6g *toxh(xwo 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 P? g o6wh //t(o.xskx*rz

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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 conventrnf;m c)g,55jq rquniu4*pv8f *xn1qional 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 t;*uqm gcjnnuq ,rv5q)5 px 4f1f8*rnihe 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-car87/2 omex ioewr2 9yowrying wires are shown end on in the figure below. The wirowy7or e/228 mwo 9exie 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 co)flz)a.8wp.5fjrvebkmt 6 7 nnventional electrical current is then run through the coil from left to right as shown. This will cause n6jb8mvfpf)l r.kea) t.7wz5 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 poin q 25kk)rzh+vbt P inside the solenoid shown isvzh+5 qkbk)2r
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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