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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 compazw h7x91d 6vfdss. When the conventional current in the conductor is from south to north and large, the N pole of h fdd1x6wz v97 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 dottda6m 8ddw gfv4 *r+p73wv-tyu ed lines shown. None of the pieces are rotated. Aftd *gy+vtwvrp7fm683d wud4- aer 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 depictsav./8nie01 gfdy.sm :1dfio x iron filings sprinkled around three permanen ydiga/81x 1f. sd:f min0ve.ot 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) euws/ umb4j 1vkpdt9eon :*6l.lectric current flows from left to right in a wire as shown in the diagram, what is the direction of thkotuu*e jp/9ws .md :4b61nvle 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 d99iow (q 0etgqka8 e07 88lyj use)oofrom left to right as shown in the accompanying diagram. Which option best represents the directionutgkiooes qy98(7d8w)alq o0ee0j98 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 vqny4p1y2k v-sics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of space. - k1 qp4vv2nyy

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 plane:2shgld pj,p lw a4yd;x47 i(p of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated 4h7(pla :d,jx;s p d4i2gpywl 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 current26zm wsq, 5kkq 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 x-axis (aside from infinity) at which the magnetic field is equal to zero from the52qmzsk6, wkq se 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 shown end on in the figure belopp0 nu9 nz(1zlw. The wlnn0 zp1uzp(9ire 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 eld74d kaqm)hi8qljr .zi;q 97iectrical current is then run through the coil from left to.7q lz9jd4rdqm8kh 7; )i iiaq 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 linj* fz1 0 ykghwq:s2hnyu; g5i+zb91t ce passing through point P inside the solenoid shown i91uyt2y ij * 5;qn ggzsfchw:1kz+ h0bs
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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