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

1#

96.27: A long straight wire conductor is plge/,pyz lep:b9tj56 g fg,, xkaced below a compass. When the conventional current in the conductor is from south to north and large, the N pole of pkf/gy, bj gzg,lx6 e9p :5e,t 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 bej,co xuc*+3m3g:x d0 v7o poto be cut in half along the dotted lines shown. None of the pieces are rotated. Afte3c3*pvxx+ bme:cod0jo, u 7ogr 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 su. ki n;)mgs0bprinkled around three permanent magnets. Pole R is the same as po)b;uk sm.gn i0les

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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 flow gb +9v0,y/0anpfrxhpzsj3wd dvt92: cn26pd s from left to right in a wire as shown in the diagram, what is the direction of the magnetic field at vynb06:gwc,pf/3+r add9nd0v2j9sp2p xhtz 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 horizrwzs ;i;43u/zsrvn wz86o kh7ontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of theu khzir;v/ wo8sznr7z3 w6s4; 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 representatbg(t)aj 6 izrwj3slv)7wo r:7w5j m;tion of magnetic field lines is inconsistent? The squares in the diagrams below simply repre:;(76rr b ow7z stmitva3 jg5)wj )wljsent 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 directed intolj4u*;dhl ti3 c3( 4idmudio6 the plane of the page as shown in the figure. Which one of the arrows shown best indicate4ldhuu3dim;6j ocil*it4 (d3 s 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 coj*yp w1ct*eh 3nventional 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 field is equal to ze31 wect*yph*jro 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-carrqa fx.x3( t-b ;d fhtrmu;a43kying wires are shown end on in the figure below. r- qdauf kf(x4.tx; ha3;mb3t The 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 coil of wire. A conventional ealji dtbq xd q+hnd.v+ qc,(.smu2 984lectrical current is then run through the coil from left to xjqbumsq48dt .+(+q vchld9.2i ad,n 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 through3wpp. gm, j(4ea fepx) point P inside the solenoid shown e.,xap)mp4 p3 ( gwejfis
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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