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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 com) ub 8nxh,jvdxcg*skw7 rshw7+,9og* pass. When the conventional current in the conductor is hw7,k8w7*nsrso*9 xv hdjg)c, xg+ ubfrom south to north 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 along the dov8sqj/ yp00qeu(( ss mtted lines shown. None of the pieces are rotated. After the cut:juq(p ss 0(vy80me s/q

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 sprinkled arw; ql-6 dunq, xjf o9fp,+*wurd2 4dcbound three permanent magnets. Pole R is the same as qrdclp4u-;wu+jn, 2ff6o q 9w,xdb*dpoles

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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 cureo w,xj007lesb9 bj(jrent flows from left to right in a wire as shown in the diagram, what is the direction of the magnesxw0b,be7 loj (90jj etic 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 from left to right ao9bs : ,s,rir rb 6vv3irl66qks shown in the accompanying diagram. Which option besi r3ror,ib9rvbsq6v: k,ls 66t 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, which27cxon x *rmv6o-akdh ad1f (. representation of magnetic field lines is inconsistent? The squares in the do1macrxxko7dhan 2-(6 f* dv.iagrams 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 conventional (w,2tk / 3feuug bqq7ycurrent directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates,2q tbe kf(/g7uy uw3q the direction of the magnetic 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 tgouu.vk-x3e .i, ebb+ he conventional 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 the plane of the page. In which Region(s) is there a place on the x-axis (aside from infinity) at which the magnetic fiel+g vx-ueou.b,e3.bkid 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 shown ends sf x);.zya3mpia;a,ujfw-5ij3 u 1w on in the figure below. The wire i5j1fuww.;-ju,szpxy ia3 f;3 aa)smon
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 electrical cu7+ xojzmm b4s-rrent is then run through thom7-mb+j z s4xe 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 solenoid shou:r:ohmfd *k zp -8/ekwn k:huezk/ r8*-p fo:mdis
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{μ_{0}}{ε_{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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