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

1#

96.27: A long straight wire conductor is placed below a co/nbgn)cg6v(6zk5egu*/dn ,jt*l- fkir x) elmpass. When the conventional current in the conductor is from south to north and large, the N pole of the co6n*gkc/et v /- gbu6d*rk5)zei)jxgl,n( fln mpass:

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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 dotteb4-0elq/ eg2prjovg, 3,zbjt d lines shown. None of the pretp g0j-e2q4vgz3 bl/, bjo,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 d 3wtrt1mip;k.7aa q c5epicts iron filings sprinkled around three permanent ap;7ck3 1twria mq5t.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 to rigt8oibr73.pm -xyw e6l ht in a wire as shown in the diagram, what is the direction of the magnetic field at point P?il3tw7 ery6po-.bx 8m

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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 fro* .u og zu/gci4zy1-mgm left to right as shown in the accompanying diagram. Which option best represents the directiouoz y*u4czgg1ig-.m /n 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 wot/g*n8q8u.emu m 8 +ig oxs,of magnetic field lines is etn/osg u*oiw8 gux8., mq+m8inconsistent? 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 directemt zixstuz-+of s5;)i92ts 88 ku8j vbd into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the8zi;f vkm tsx52)9b8uzt j+oti 8s s-u 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 conventize1+, jhew s.9a pbfb1-r)dl conal 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 magn9 eblzhdrwa,cb-1) +fe.j1spetic 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 longz3p+u;m f7bci8 onj4r current-carrying wires are shown end on in the figure below. The wi f;bnm 74ru3+cjiz 8opre 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 cono7;t8jee/rmiwtxq g3,r.ei 6 ventional electrical current is then run through the coil from left to right as shown. This wil w 37;.q6tgxetjrm8roieie / ,l 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 showncp +v(hpikkx)u/ p+ (n is+p)pkn/ (+ k ipx(uhvc
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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