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

1#

96.27: A long straight wire km , mg(mrc73tlex5qy-:wl3zhg4 /cs conductor is placed below a compass. When the conventional current in the conductor is from socz 4mrxs:qt ll 375mmw,kch-e3y (gg/uth 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 zaq rj3j0 mc9hb2m)a* are to be cut in half along the dotted lines shown. None of the pieces are ro*ha3m zm9rqjjb )a 02ctated. 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 tg;zt1tex)zv 8k2hz3ij(2bpthree permahgetzk)2;( bzz8xi32v 1tp tjnent 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 (posjn2zj llm5:qzq 6(aoqg. 5 n:4wplvt 5itive) electric current flows from left to right in a wire as shown in the diagram, what is the direction of the magn6 (qqpl5nzq:z5.v 5 4jjaogl:m w n2tletic 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 hor.nf) 5jo,re jbizontal wire from left to right as sj5,r b oj)n.fehown in the accompanying 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 under .2iv n 6h6syndu0*wmmykl*.as9j4c v standing of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions*yk vn 4jm . 6n2h6slmcy.di9*0 uwavs 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 directertsy -8z5t 6ded into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetict d8syezrt- 56 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 sf62 formcyd89e5an2ko 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 infinity) at which the magnetic field is equal tdff25 c6yk8o r 9man2eo 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 izo; bzll qnxv 9,a9z(bc2e-.kn the figure below. The wirbc99eoz;lx.(b a qk lvz2 z,-ne 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. ;,lpt9,;7hbu3 g4avw acaq woA conventional electrical current is then run7c l g;buqha;a9, v,a3opt4w w 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 t2y rnrzi :-g-dgaqi3ohlj2 ) :hrough point P inside the solenoid shown isr nlyi)q i2-rao: z3j:gdhg -2
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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