magnet and magnetic field lines - 无忧得胜-网上国际课程 (5edu.win)

1#

96.27: A long straight wire conductor is placed below a compass.hca(,rqe v6 4b,kl4vl When the conventional current ihlvke6 ,4r qcv(lb4,an 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:i44dn8;erz6b 8l. dqyuz eeh are to be cut in half along the dotted lines shown. None of the pieces arey8:iqde 4r 8d.4hb6l nz;e euz 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 irnbz 1h ;fik ) ycg2tntb55)jn:on filings sprinkled around three permanent magnets.jb kn h)n1:nyi 2g5t)f;b5ctz 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) electrix lzjvea;xqk; ,-t e*w 7+c:ezc current flows from left to right in a wire as shown in the diagram, what is the direction of thw+ce*vz:l x tj;aq -xe;,ek7ze 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 lef:1n7 ira)hf nht to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at poir i7ah hnnf):1nt 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 phcm 38 shixn8d2ysics, which representation of magnetic field lines is inconsistent? The squares ini8dcm3 8n2xh s 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 directed into the 8kfo+vfq i;sgqi(),i cf34-ky pg6qp plane of the page as shown in the figure. Which one of the arrows shown best iq )i4qps+qg6p8kvf- kc3(foy ,fg ;iindicates 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 aredjrk .(9v xjw4 fixed in space so 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 to xrkv(4 9wj jd.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 in the figure d3.xz6w: ngm i*tb1bubelow. The bti6xw:bm. 3n1 gz*udwire 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 dw) 6iinh-5ht wire. A conventional electrical current is then run throuhihn6d5i w -t)gh 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 throug* lewz6iwrwpb919 e8:0v lm hf 3.pkemh point P inside the solenoid shown 6 :vw1lm8f3 pp wele.hr bemz*i 9w09kis
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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