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

1#

96.27: A long straight wire conductor is placed below a compass. When t 9q( vch73dv)f1il ru+gwc9luhe conventional current in the conductor is from south to north and large, thedvwr ) 9vh7cl+fuicu13q9l g( 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 4f3 u53bjq eedht7x1m of the pieces are rotated. After the cutq3mbxu5 etehdf3 j174 :

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 threqt9y x:wvc) :le permanent magnets. Pole R is theq:yxctw9l v) : 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 frot/.3 5m9enxaets o qe+m 2uz9zm left to right in a wire as shown in the diagram, what is the direction /azze.to+n5e 9s39uqe xmmt2of 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 curr8pnfbk *21 bum9gea,nawsd5 f.--nlrent flows through a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at pn2sar epkd 89 bufa -wmg ,5bf*1nl.-noint 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 ow,;8 pti( wclgf physics, which representation of magnetic field lines is inconl;(wgwtip8c, sistent? 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 conventq9 )trhk(2u lgional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wire at thl2uh)(kt qgr9e 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 xb 2ig -0h-y foe;f9uwspace so that the conventional current in the left wire (2 A) comes out of the pl efuhif2gbyow9-x; -0ane 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 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 ffm/2g 8* nc;9lfl8k dm x/ hfr*sp6yzrigure below. The wire o 9x/*d8mzr 8hfsn/*glm6p yf lc2 ;frkn
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 elepejc81.l)b mi7sl, et5 jb8p gctrical current is then run through the coil from left to right ae8gs m j)5 pt8,.b ijlbc1lpe7s 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 the solenoid show -/njd :rs7tu d4m pywij00)vvn is4: sv-pwj/00n td ) d7vuijyrm
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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