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

1#

96.27: A long straight wire conductor is placed below a compass. When thefcs gcrl0tb-8hg0 xa j )*h*g2 conventional current in the conductor is from south to north and large, the N po*fg 0gbtcjlg-82)r h x0sch*ale 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 ha*2so/d/iznl b8nv0y.13jl /afpg7-zw civ kl lf along the dotted lines shown. None ofn g.f2d/zl/8i psj /l vcyv*1 nz3akl-owb70i the pieces 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 threz48 gw fqbuf+3e permanenzfq34w8u +g fbt 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 curr7 r 8h)gw+fcosyj*cd*j -js8u ent flows from left to right in a wire as shown in the diagram, what is the directo- guw*78rjhc 8j +ysf)c jds*ion 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 toaz*buil-s0yg2 7 la: t right as shown in the accompanying diagram. Which option best represents the direction of the magnetic 2at zi glsb 7ua:0-ly*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 1 *k+ i/oy */ 5b2jxtjobjkiyvof magnetic field lines is inconsistent? The squares in the diaji*o j *y1tkk bo j2x5v+/bi/ygrams 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 conven:5oy aor8iyw 4++jr0 fzd)mgqtional current directed into the plane of the page as s5+zwd4iymrq ary )8j o:f +0gohown in the figure. Which one of the arrows 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 fixb/j;mg 34m cwled in space so that the conventional current in the left wire m/w; b4jg3mc l(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 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-adr aiuauf .of3z 16n39d 3b-bcarrying wires are shown end on in the figure below. Thei6bornzdf du3-a93ua .3b 1af wire 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 conventionanw5qlh :h9m)3l9ytxy-1acaol electrical current is then run through the coil from left to right as shown. This will cause the ya9lh:yc5nq 19)tlo wmh 3x-aNorth 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 thev bgzc-pq, 8l7 solenoid shown is plzvb8q-g7 c,
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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