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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: 匿名未登录开始时间: 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 compass. When the convev9f:kxnbu9t )l7e mf-ntional current in the conductor is from south to northn7evfk 9l9x:- fmbut) and 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 cut in half alok4i x;p2 zl+mwng the dotted lines shown. None of the pieces are rotated. After t x4zp2l+kiw; mhe 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 depif3mp46zt2 d79qjnv cm cts iron filings sprinkled around three permacn v7 2dmq49mpfz3tj6nent magnets. 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 flows fromuc8rh)4zt6 ga93 d (5ihe;9wtpd emkr left to right in a wire as shown in the diagram, what is the direction of the magnetic fide(m;daktr ze3h 6ig9hp5c4u r89) wteld 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 th ;nug;y-f+2bp ckets4rough a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magn;n ype;fg2tb+ suk4 -cetic 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 p s61s. or5ekx..h:i o(npxggghysics, which representation of magnetic field lines is inconsistent?s1:x xsgg65 e. i n.phg.(okor 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 c ,ujc)(4e3u wxr ubbas.jh1i jo*cy5; onventional 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 magnetic field associated withw *,x ;3csbauuyj.cjbh5ou 41) i (jer 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 curren3;nj -wf c*omht in the left wire (2 A) comes out of the plane of the page and the conventionnco-h3 mj*f;wal current in the right wire (3 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-carrying wires are t*umrh1h3zfik 7u z)i. 0i(0lrv zrn9shown end on in the figure below. Thu)mlt0z1 hfh *37 rviz r 0i(znr9ui.ke 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 convev xbt (.satn)4ntional electrical current is then run through the coil from s .(nx4at)vb tleft 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 po5 yvx17,oj buacf q;6uint P inside the solenoid shown is 1vj,x;c7 6afyu5u qob
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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