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

1#

96.27: A long straight wire conductor is pl(ptysnjk(yk2 ry:19q/g x (fz *dhji, aced below a compass. When the conventional current in the conductor is from,gs:((jy/ n d ixkfh1zyqjk9y*pr( 2t 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 to be cut in half along the dottedp1do vmj8 4gix ),nw,q rqi5*m lines shown. None of the pieces vxiproqi)dm4 q8njm5,,1 wg* are 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 thrict)f 9: ndkic8ltj*. kx6 j5rga l8+qee permanent magnets. Pole R is the saml859.n)gq calt6x*+ j8f ik:dji k tcre 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 convention x3qmu40hydfbsef6 ; 1iu6 5ypal (positive) electric current flows from left to right in a wire as 6q5ieuu6 h sdym3fpxf0b ;4y1shown in the 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 c hvoyfe.:845o , pexqyurrent flows through a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction 8eh yo.4vf, :5y poeqxof 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 representation of ik 0s7s8s0yr*yljx( fmagnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of0siyj0x87 (yf* s lrsk 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 ha:u(k h1esss u*s a conventional 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 the locatiose hkus(su *:1n 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 svwd85(jmhn/jq(8 iiitk s a89c;b c qk28 zx;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 9m8n8;8b(vsxzkc5 jh2wq tsi8(i; qcijda /kequal 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 wirzk/u/ u7qg/ j)1 esabies are shown end on in the figure below. The wire obqs7/)ia/k 1g u juez/n
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 ov vvgi +7sgc27f wire. A conventional electrical current is then run through the coil from left to right as shown. This wilgv77cigsv2+ vl 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 smma . n1.zfm(pui dhd,oo4kvzz(0s 1 .hown znm v.m,m4( af1sd.01o.k hzio ( puzdis
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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