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

1#

96.27: A long straight wire b;t ul g1zvq6/hpf+ 17bezpa0 conductor is placed below a compass. When the conventional cuv/ze pbl+7b1p 6ztha uf10;gqrrent 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 (d qg7fsj d8-rncl vi6 fb+y4+ lr)r(hhalf along the dotted lines shown. None of the pieces arev -riq+d6(y 8cnhf llrj4bs) rg7(d+f 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 filings sprinkled around three perel :(0q .g y8zr)udmwvg5j:y emanen rd8 (::gje qu vylgy.w)05zmet 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 from left nrlgs+7hgt: 7(61.0ppumj zi cyfss(i okn9, to right in a wire as shown in the diagram, what is the direction of the magno(.yi,m (rpjgs70s 6g:nfp h9zkn s7 +utl1icetic 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 through a horizontal wire from left 8 rq8xha 5;gofto right as shown in the accompanying diagram. Which option bes5fqh gox ar88;t 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 representation o9 bfm/v-xc5brkx pcy/ p *,kz7f magnetic bvyp/- ,9pc75x/ xmrkz fk b*cfield lines is inconsistent? 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 directed into t5/h1cibk2 v ovhe plane of the page as shown in the figure. Wh5kvi2ob /cv1h ich 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 are fixed in spa bvtsb8(hbga7cbya 4- d5bv:: ce so that the conventional 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)h8btdb :bb s4ybavv : a-c7g5( 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 figuono*pc1 s-8;grq20ijbdy2 vire below. The wqgcb;jdiy p 0 i*82rs-v o2no1ire 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 electrical cu1 ,scz )2 d- fq32dfql6xjenbkrrent is then run through the coil from left to right as shown. This will cause the North pole of the compdx ,j6qf-nfs2e1q 3l bkz d2)cass 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 solenoid showze55/s 5 v2qrf6uxwv pn is/ fvwuq rv6e55sp25 xz
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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