magnet and magnetic field lines - 无忧得胜-网上国际课程 (5edu.win)

?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 cojj)bk u0b:4:uf nvk4iyb(iv 9 nductor is placed below a compass. When the conventional current in the conductor is from south to north an kj4fj nbiyub0 ib9k4)(vuv::d 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 cut39*ce4 e6zuetyr* qhb in half along the dotted lines shown. None of the pzteeb q*ry9*uh 34 e6cieces 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 spry7 i49wql*scx inkled around three permanent magnetsswq*i y49lc7 x. 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 flo(ov)zbr+.y 9mhw je u2h7k8kiws from left to right in a wire as shown in the diagram, what is the dirhv 7( z o)9r+wbjue h.kk2miy8ection 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 fwq-i7-d-irn 1 . kemghk z95xelows through a horizontal wire from left to right as shown in the accompanyingg--e7x.i ed9 ki1-qzk n5w rhm 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 rxasgo; *rr2; obl/bb/epresentation of magnetic field lines is inconsistent? The squares in the diagrams below simpl;ob;xg/aro rls2b/*by 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 current directed into the plan.d g1gxwz d66se 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 ladgxgsw 6d. z16beled 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 s6b 24jfxtw m.to9u ew:pace 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 (3b wemtj9 4:w t6xuf.o2 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 current-jqfmgtv -eul;tm2+/ :5b.iv hcarrying wires are shown end on in the figure below. T/beg 2.+v im5tvjm;qht:f lu -he 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 conventional ele3houj2j2r -as ctrical current is then jo3u ras-22hjrun 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 through point P inside the *eut*ac;p11p f 65douyyi r+isolenoid shown ity15; upie*r *6d1pcyao+ui fs
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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