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

1#

96.27: A long straight wire conductor is placed below u( q;1n8a.pa+ qn5 apar d)qu6(tjfzwa compass. When the conventional current in the conductor afqqapnr aw;u1u ( znda+5j68( t)p.qis 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 : +g4 ntrbufatusbz*h,n /:1l the dotted lines shown. None of the pieces are rotated. nzt4h:1tubn , a:sbu/g*+l r fAfter 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 ri)w+gm5tgdb 8e ght depicts iron filings sprinkled around three permanent magnets. Pole R is the same as+w)t8ge mdbg5 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) electric9 en7p d:j.cxa current flows from left to right in a wire as shown in the diagram, what is the ddx:e 97acp.jn irection of the 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 through a horizontal w2g,kk ,/btgg.x2nxsyqe( l : by:qe8rire from left to right as shown in the accompanying d2q8/ kx(:sn ykrq,lyge.:gbxbg ,t2e iagram. 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 currenttw:-ihs2;2:e gmdv9iyaw g . j understanding of physics, which representation of magnetic field lines is inconsistent? The squares in the dws: it;2 hd9e-wyv.2ij:agg miagrams 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 the pljg,q8bn:i4/ s-v qgp nane of the page as shown in the figure. Which one of the arrows showvj q4:b g,/qgpn-s 8inn 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 spaceg rf3(d+ -;tw-ed0n- xa nqhtc 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) is there a place on the x-axis (asidg dd+n tca0wxtr(f--3n- hq;e e 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 figure bg3tn5.5gb wfx3 doih/elow. The wigo/f t.in 53 3wbg5dhxre 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 wbh1hk ln6a)a7a4:whg ire. A conventional electrical current is thklanahgh7w:1 b )6 4ahen run 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 field line passing through point P inside thev : 6 106m3-bvhn jqpyejzcip( solenoid shown iv1 jv60 hi-q :yczn(ebpmp6j3s
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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