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

1#

96.27: A long straight wire conductor is placed below a compass. When the ..s d;foj82 7yvvtoua6zrk k*conventional current in the conductor is from south to norths2uyod7v; azjko* 8ktr 6 v.f. and large, 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.vn41y 7;0psx bswxw lines shown. None of the pieces are rotatedsp.bx0nlv y7;4w 1wsx. 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 filings sprinkledm3te q3k(ko+ vm93gjm around three permanent m3kg9emm3+ (3oj q mkvtagnets. 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 current flows from left to right in dzog0hk1d f;,vf/; wya wire as shown in the diagram, what is the direction of the magnetic field aw,d; vzhg;0 f1/kfodyt 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 hu 4h.rkrtwut6:au4, 5c8qfv lorizontal wire from left to right as shown in the accompanying diagram. Which option b c .4u:hvu,f4a t5qwkru6trl8est 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 current understanding of physics, which represekg6yam+qxx-ib/ 4m(kw8 dg; s ntation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions os 8yxg6mxw ;( kg+d-4bm/akiq f 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 convention( q--fy 3tgkx-pp(m.0t qnik/ii.kzmal current directed into the plane of the page ap.(kik3-i i n0(/pmqq- tz f kmg-tx.ys 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 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 tz02hhxz 6/; gy9j7c9lvbog tlrt2 x2are fixed in space so that the conventional current in the left wire (2 A) comes out of the plane of the page and tlt; 2h2vzjxtygc2b/96 z0lhor x 9g7the 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 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 are shw5 a 2onc/1zax)utsg 4own end on in the figure below. The w)tzo 2acu54 g1sn/wa xire 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 electxt h1h4a s0bju70 3qzdrical current is then run through the coil from left to right as shown. This will cause the North pole of the h 3asd0zx0u bhtq4 1j7compass 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 rvy,b7+ r zq8)+qtezcP inside the solenoid shown is trqz+y)z8+rev q, bc7
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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