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

1#

96.27: A long straight wire conductor is 4 lvq4d,2 zx:stch)beplaced below a compass. When the conventional current in the conductor is from south to north and large, the N )qbcl4xtvs,z4:h e2dpole 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 be9yev,6;gess 0zcx,y d cut in half along the dotted lines shown. None of the pieces are rotated. Aftesyc,yez6 sg9, v; d0xer 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 y k*0,ss+c ihsqb)6, fqlb 7gapermanent magnets. Pole R is the same as polelic)yqq h gak0fsssb*6, b +7,s

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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 (p9+1uo+ bjg10bjlh xirv k(kl1ositive) electric current flows from left to right in a wire as shown in thek911 jh (b+kvl0 +x b1jolgiur diagram, 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 flowse j h0wm7ngtj 10.gl6t through a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field 6 hj07lgjgtt .10mwen 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 wob0aw gi.8 b8of physics, which representation of magnetic field lines is inconsistent? The squares in the oag 8wwbi8.0b 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 hasjv*vmghs .1+/n/tibx a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indic h xvmv/ n.1s*i/bt+jgates 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 fixe* l/i6bb(qolug ntp*+ir r3j.d in space 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 (aside from infinity) at which the magnetic field is equal to zero frob* b rui+t g.6lp*iqro (j3ln/m 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 eclzviv( mv9gcx w/ + e5x. g3k2l-d+ycnd on in the figure belowv5+vdxlyzkgc (2v./lm gx+e i9 c- w3c. The 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 near a coil of wire. A conventional electrical cu9:mcp,o mz9eq6lvd-qrrent is then rpd6ommc9:qqv9 e -l z,un 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 smcb q+ b 2(nck5)sx6gthe solenoid shown i)kx g 2q(5bc+bc ns6sms
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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