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

1#

96.27: A long straight wire conductor is placed below ;+utc( bq) gkta compass. When the conventional current in the conductor is from south to north and large, the ( tk+ ugb;c)qtN 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 io+v5dmz m q-b0fhazhv.2 y;8tn half along the dotted lines shown. None of the pmdhh0a vtyzom v2+8-b.z q5f;ieces 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 three +ft3 k pdprhmw9 7 /trf;5kup1permanet1t; kk75p/f fu+p w3 rhrpd9mnt 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 left t. o (.r)fu-v7/( 7 qwxpm0vhybnu csyso right in a wire as sho7yxnmw/ps-.r (0yqb.7uf)(shuvcovwn 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 current flows through a horizontal wire from left to righ)j6(mn7gwih ;hi-v jzt as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at point P?i7gwh 6m(ijjz-nv ;)h

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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 gq *e2cher*ls*0.cf r fb+, numagneter 0ch.lgnb+e* ,*ucrq sf* 2fic field lines is inconsistent? The squares 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 wire has a conventional current divyvphsqy3z5ay dt:0 )( avt93 rected 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 locati vya5ytyp: as9)0 v33d qhtzv(on 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 sg gj*tmbo;2t)2 zu,nir *w 2jio 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 iwj) 2 i2j ibg*t u*rzgo2;,nmtnfinity) 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 ari 5hq 2;:3tgosg 8ac4rhd)(oxcz1nore shown end on in the figure below. The wir8 x) d 1h nacr;g:i4(2soztg oh3or5qce 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 electricrmdd fn+dfeh*r 133z 8al current is then run through the coil from left to right asrnrd3m +38 1efhfddz * 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 the solens 5 d-)rl yvvoy/v3awv2v1)fgoid shown/lsv)o rwga)v35 vdy 1f yv-v2 is
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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