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

1#

96.27: A long straight wire conductor is placed below a o+-;q(lu xj fk:k5ufg compass. When the conventional current l(fj+ku 5q o-;k:xugf in the conductor is from south to north 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 i(uwnu7q zoo ia7.js/vjpb 7) 1n half along the dotted lines shown. None of the pieces are rotated.7 oso7jauqn zi71 )b/(uwj. pv 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 sprinkle 9e (4fo5qqyoud around three permanent magnets. 9(5ufoq4 eoqyPole 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 flb . q*e x)ys;8q(jn5 ztna *mivp9sl(tows from left to right in a wire as shown in the diagram, what is the direction of thnj b5;asz yv m*qelts)*9i8tp(n(x.qe magnetic field 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 -gmz k7xi7g4p through a horizontal wire from left to right as shown in the accompanyimi- gz 7p7x4gkng 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 current understanc a,(60tw xi5 c7kcdmkding of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of cw0 ctckm(d x576iak, 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 9ej(mtevm6ia2a 5bp p f3b6j9conventional current directed into the plane of the page as shown in the figure. Which one j5fb6e (vim6tp29jb3aae 9 mpof 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 are fixed in space so that the c/qq- v2e0c(1efsare ny3bpc qy 6ab (;onventional 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 Rayqsvcy2rb;(eq/ e3qf- 01ep(c6 na b egion(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 jty;gf9zh: jg(7,s vg are shown end on in the figure below. Th t(v,sf79;g gj:gzyjhe 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 c lg rgl*w*w1zvub/(wg,v- zq-oil of wire. A conventional electrical current is then run 1wvz b*/-q w g(wlzrvul ,gg-*through the 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 fjvh5ywz/5 lqi apjo0 6vmf;n05nx o7: ield line passing through point P inside the solenoid shown izq/jl:7n0 hx j n5fyai5m o; v0wpv5o6s
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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