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

1#

96.27: A long straight wire conductor is vycokld05sv+3lc( qq tm8q .*placed below a compass. When the conventional current in the conductor is from south to +dmc*vql. lv0qcko q5(y38st 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 t+1w26aco41hwp iuyb -go0i o co be cut in half along the dotted lines shown. None of the pieces are a60 2 b c1 +w1uyp4iwgh-coooirotated. 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 depif t wx60m7m(uycts iron filings sprinkled around three permanent magnets. Pole R is the satx( m6w7ymu f0me 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 f)x f 0h6cf;ju;a g07 ro:afxfslows from left to right in a wire as shown in the diagram, what is the direction of the magnetic fi: f70s ;fc)x6; offjr axhg0aueld 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 throuhuxs,ciuy t:i3k+ xl-l/ eh :)gh a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents tu) :che3lluix h,x t-sy:i+k/he direction of 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 ofgqkc; i /g9 +yy*,akiu magnetic field lines is inconsistent? The squares in the diagrams below simply repre q/ acku+g*ky,y i9;igsent 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 conventrn1 5-vvi;*cgh . ljgk, 5uuqyional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the directiu;qvuch,l1*5 -jrv5n g gy.ikon 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 fixed in space so that the conventional curr2w:i a:xweoz)g wugo ;6ak:;y 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) a xz2;aoy :6gg kw ;)w:uwoi:eat 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-czmhiecpg5o/a45e4 -8r wn7z aarrying wires are shown end on in the figure below. The wiram4 z gaiec8n rz/4w5-e5h p7oe 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 currenm so8+-2cntydc2t:aoh1mwj 9urpfj1 yh04. m t is then rucn2m 2-.ampy:th jtw1d0 c yr4+o1jsu9m8hfon 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 the sole dgjb hzu(-//wiul h*.noid shown is.zgbulw*jiduh- / h( /
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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