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

1#

96.27: A long straight wire conductor is placed below a comtjysu88nr *az2o w. 4kz7s5jedig) j* pass. When the conventional current in thet4jo*7zwusj8r8kai e ) .j2 zy5*sndg 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 toe1qkph-n20sl/ ncj4 9l8l yv o be cut in half along the dotted lines shown. None of the pieces are rotated. Aft1j/q8ll elok4 pn y0c-29svnher 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 pery4q rw4wm2 r,* s-vwzwmanentw rym sqzr-4,wwv*4w2 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 c;j(bbpt:t prp0vhfg n.5 mu49urrent flows from left to right in a wire as shown in the diagram, what is the direction ob t54jtmpb 9ng u0:;p(vfhrp.f 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 , nrxs0lec hn0s2o +cozvj.pm(2+v .ga horizontal wire from left to right as shoncxs h+lm.jorse0.v c (v0 ,2z+opng2wn in the accompanying 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 understanding of physics, which represt 6h/rac j*(atentation of magnetic field lines is inconsistent? The squares in the diagrams below s j(ct*a6/r ahtimply 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 convent: 0ur:uq we7h :uldb3i9 j:yfzional current directed into the plane of the page as shown in the figure. Which one of the arrows shownwuhb ye : f:ljq7ru:: 930dzui 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 conventional current i/ s(h71yu xa3fdgq5 ebn 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 7xe a( hgfusy/dq13b5 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 mxnp lwf5) 18tc7v i/fend on in the figure below. Th8/x5tv)wlfnfm c71 ip e 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 neqlm 9 .gm5ndm++z .punar a coil of wire. A conventional electrical current is then runm.ulgp qn59z+ m. mdn+ 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 i9q+lg. u rj/adh*ap5 v i/fvdl g5pr),nside the solenoid showna j l9ppurigq/5 .)va5/*grfld+dv,h is
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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