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

1#

96.27: A long straight wire conductor is pla fw:v1 got.e7nced below a compass. When the conventional current in the conductor is from south to north and large, the g1 vewn 7f.o:tN 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 cutxckvf 8ny:smh6j 5k kpg5-:,w in half along the dotted lines shown. None of the pieces a:g86j,k-k5v hn 5 mkfp ywcxs:re 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 thr*c b.nexle oin/1 a*tb wib)(/ m2xv.k,h9uy xee permanent magnets. Pole R is the savbix2/txice, o9 .e.xwyhu( nb)n1lkm*b a*/me 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 curreip cd a;srr2 qgx2x:)2nt flows from left to right in a wire as shown in the diagram, whax grcps2 daxr;2iq2):t 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 thj ) kpehcu2 1q*7bu+wmrough a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetiuq)kj 2w 71ehpu +c*bmc 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 represe pi* jfz9cz211b 9hzrcntation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regionsp 1zjcz9b921 rzi*fc h 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 cubxi)o(7zi3x k w hnk-*rrent directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the kh3k(xbi*nzw-o ix )7 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 currs *ud4g ci4wfwi9 .q:gi-tkv+ent 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 is equal to zercgdg qi4-wu:w. i9t4v*fk +iso 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 ar )n9bwp agw5od*yt-u7 e shown end on in the figure below. The wire on -7w y awtnpg9 ou*5)bd
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 near0xkl7 f q4uo.d a coil of wire. A conventional electrical current is then run throu qul. od40xf7kgh 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 lzdlf7u+acc0l,u dm.no9wo m s+2 kx,1ine passing through point P inside the solenoid shown iz+ a+2 cn9oldmulu7.df xmc,ok1sw0,s
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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