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

1#

96.27: A long straight wire conduc -xvn6-thy65xnn(zpctor is placed below a compass. When the conventional cun(66hyxpnv5 - tn- cxzrrent 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 in half along the dotted lines shown. None .35env99aggvy3 t ctm of the pieces are rotated. cy95tgv.g mevtan 933After 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 depy+nf qre4lp)3icts iron filings sprinkled around three permey 3p4)nql r+fanent magnets. 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 fp3p(/d3k3k tb dkxxc,rom left to right in a wire as shown in the diagram, what is the direction of the magnetic field atkpdx tkxdb,33pc3 k(/ 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 horizontal wire from left to rk -h*lkd hmcumkzk,h 4c;*6y6ight as shown in the accompanying diagram. Which option best represents the direction of the magnetic fiel*m hd- ylh6kku*ch,6 kzkmc; 4d 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 ko.h w(t* wv3(vqdbs3a3oxl-representation of magnetic field lines is inx(vl3w bohs3 ad*3ovkq- (wt.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 currentd/z 8qke7 nd oicz+:2d directed into the plane of the page as shown in the figure. Which onedkzo zi2e8 /+ q:7ddcn 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 are fixed9a3-t1kk2;7 u7rmb gus ypxlz in space so that the conventional current in the left wire (2 A) comes out of the plane of t-ztbrmu syk12gxk7; pu 73al9he 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 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 shown end on in the figqmamn1eho, w;7 omfc :o f7-*zure below. The wire onwmc7fnamm:h o1e 7- q;ofo *z,
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 cov4 j:;a b) zprp+6jg .;shoucuil of wire. A conventional electrical current is then run through the coil from left to right as shown. This will cause the Nort ;ua;4 :+.p)r6cbvzugjjph osh 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 - 1nhl)z8 6sgu p,twvrinside the solenoid shown is tzwsr lh1)v-86 p,ugn
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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