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

1#

96.27: A long straight wire conductomtvci+e u j;20r is placed below a compass. When the conventional current im+;uv2ce t j0in the conductor is from 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 dotted lines sh706yyi28xv73e -vml bkb j knpown. None of the pieces are rotated. After l8e 0jxmbk- 2bv y kny7763ivpthe 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 deo5d -e zw 29g7z r+tflyoze*6ppicts iron filings sprinkled around three permand5 *+er 9wzoefgoz-t7y2 6 pzlent 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 (pe4ut. -*qg sto //mnlvositive) electric current flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic field at point*tt. o//gs meq4unl-v 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 f-.wlh52u8 98plo 6gbju 9v pmvmc;rrqrom left to right as shown in the accompanying ur8 p8hlw vc u2m- oqj.9b6gmplrv9 5;diagram. Which option best represents the 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 representatiofld33w vrm9 (xm yg4ppaa8 s2,n of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of space.pxwl3mys ( 83pgm249frdav,a

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 directed in4t : cju*bvlw -mev;-jto the plane of the page as shown in the figure. Which one of the arrm-:jcevwtv*-4;l b ujows shown best indicates 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 fixed in (f8 9oh31n vy 5fvo zmpbk9p/yspace so that the conventional current in the left wire (2 A) comes out of the plane of the page and the conventional current in b5k 8o f/hofn 31v(9zvymy p9pthe 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 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-carh kmowv6uu09i 1fx+ 4krying wires are shown end on in the figure below. The wire oi 4vkm1+60uuwhkxf 9on
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 omc o lgu f /dz0 ho,3xma1j2(a5rtw 8*aa5zya5f wire. A conventional electrical current is then run through the coil from left to right as wu jo1gd fx/mh3zc(r0yz255,aama oa*tl58a 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 passincide0u h :;km)/k u,-lqni3ui g through point P inside the solenoid shown is , kkuiqm;0le d-nc/ii)uu3 :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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