magnet and magnetic field lines - 题库网 (tiku.one)

1#

96.27: A long straight wire conductor is pbh6; )) ;tx;t).fqpue c qjwsmlaced below a compass. When the conventional current in the conductor is from south to north and large,q)j wp ehq);;. 6tu b)mtsxfc; the N pole of the compass:

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2#

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 dotted l 2peo0(nb ef uk,vds+:ines shown. None of e02: bsfeo,+ukn(vp dthe pieces 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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3#

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 filiny.mm1 pagzk +3gs sprinkled around three permanent magnetmmk a+g1z.y3ps. Pole R is the same as poles

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.04: If conventional (positive) electric curre+/ygxtp3e5:; rno jl int flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic fieldgo yrtx p;+:nle3ji/5 at point P?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.02: An electric current flows through a hsof4h ( 9tc9x*kfy ds cd7)ocsm/d/0rorizontal wire from left to right as shown 9 sc/(*y/ ) d4rhofmscx9d0d oktc7fsin the accompanying diagram. Which option best represents the direction of the magnetic field at point P?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.41: From our currenis a+dz /sx394r)9exej;ct7tsh8rtf t understanding of physics, which representation of magnetic field lines is insar3; /stxxt9 feh 8 9c)74tis zrdej+consistent? The squares in the diagrams below simply represent regions of space.

A. B. C. D.

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7#

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 dixyc+irt8fk: k: x4iz. r57oojrected into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magne54t:z:+8 kiox . xofycri7krjtic field associated with this wire at the location labeled P?

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8#

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 current in 6e 6:bcbe47h.iojbcuthe 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 7hu 4bc 6biebo.j:6cex-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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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.31: Two very long current-carrying wires ar 8+yw:ka q j-d8w/*qwtuwqy z:e shown end on in the figure below. The wire on :q-q 8uaz*+8ww dwwy : jyk/qt
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 placedzt8g8 :o *bkl2zp qpl7 near a coil of wire. A conventional electrical current is then run through the coil from left to right as shown. This will :bt o7l2lzk *8q8pzgpcause 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 soleno):ta6t. bh+fg wjn2j 99sdog cid shown is jwdo6)gh n g cs2t 9tj:fb.a+9
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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