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

1#

96.27: A long straight wire conductor is placed below a compass. Wh.m 3xr nlrutb5 /vh4a)en the conventional current in the conductor is from south to north and large, the N pole of 4 rbvl/)taxrmu53 hn . 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 linesu+3vx8,cxn3vlw r8k 0 y,s cbs shown. None of the pieces are rotated. After t83+ c0ssxur8bvw v,xyc ,l3 nkhe 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 righ7d 6d )fgrc4ro gaehn ,4;uygnipeh7 2tk*1 (it depicts iron filings sprinkled around three permanent magnets. Pole R is the same as pol4dk pe iygedn i* c,h6g12f7on (7ug4hra);tres

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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 (positivfoxc(,s/ ,xa:m 9*mn jp)vjp ee) electric current flows from left to right in a wire as shown in the diagrpv ap,o x fmm,jne(s :cj9x)/*am, what is the direction 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 wire from left to righ,l.axqg3 ),ejtz k 88o gzui,it as shown in the accompanying diagram. Which option best represents the direction of the magnetqo,i8lzex z), g.3a,gjk u8 itic 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 of ma nadii;v651 za6ig q-sgnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of s;6a5 dii qsgiazvn-16 pace.

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 curren 70ut,c s 4y mb:gw.pp2rn;hibt 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 wi:g.,4ctyr ;bp0hnpu27s wbi mre 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 curreyeqh.u7 q tcd +/rl7;cnt 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 (aside from infinity) at which the magnetic field ie+; rt7/7yqhd c ql.cus 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 b cz v*9c a7co,nbqc9 (d-3nkrmelow. The w9rk*c(m-c nnc3zdb 7caq o,v9ire 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 elec(wv.tm j8,,bv)ol uxr nc33n qtrical current is then run through the coil from left to riocv.qm r3v8, ,ln(3u)tx nb jwght 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 konxn6)hk /6 gv,9 bxhpassing through point P inside the solenoid shown gb6no vxk6 kxhn,) h/9is
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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