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

1#

96.27: A long straight wire ijr* u dy 89-hvk7ziz-conductor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N - drk j*9-uz8iiyhv7z 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 inp 6m+.e i/ rnfd93f;ymukm ,js half along the dotted lines shown. None of the pieces are rotn ;.fyr,ds +m pifmeu/9jm63kated. 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 , z(zsy:oo,zxiron filings sprinkled around three permanoz(,yozszx: ,ent magnets. Pole R is the 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 from lef3zlpc6q+ n,hrckqeo.u3 .5b eu)ae c)t to right in a wire as shown in the daqel3u 6cp)o, .hkzrbun)e5e+.q c3ciagram, 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 2 pv :lijxphtoz41 4b9to right as shown in the accompanying diagram. Which option best represents the direction of the magnettl94i2 opbv 1h4jz px:ic 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 understa)xhj(1*sq5w/osvjx d2 vd) elnding of physics, which representation of magnetic field lines is inconsistent? The sdj25dj)vqvx1)/l xhs( *oswequares 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 ;ibzy(mkw3q t/5 ih8ai 4k7i jxt-hyzs g79)hwire has 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 tgt4h zhbi95xw78(tmi)ks7/y3ih ; k ay- jqz ihis 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 finfgk.wde67 wb f4q9x0xed 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 fnf7.fb6w9 wd0ekg4xq rom 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 figurelo eve4q5+gk zia+d/5auw)o . below. Theq. zg/ea + el)uw5ooia4k5vd + 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 t*v emvvdxkp3v6d z 666ayz,1 current is then run through the coil from left to right as shozk v*z vv66 ,edyxtdp66a1v m3wn. 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 xh1n/t 3e,arh6ljaj v4:tw h0field line passing through point P inside the solenoid shown 0lh , /r hv4atj:ew thn63j1xais
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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