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 compt3ta2x h.u*t15 rv-a fbw-s jwass. When the conventional current in the conductor is from south thtwra-2a*x - t13jsub5vw.t fo 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 shown. Nona zo8a h6hz2r.e of the pieces are rotated. After th8.h2ah arozz6 e 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 three , oqo2n,a5dd s( +gorupermanent magnet ,oa(q2+g uoo rd5,dsns. 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 izag,-ew 5ry9 1. ohouleft to right in a wire as shown in the diagram, what is the directio9,o zwehg1.u-ia 5yr on 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 to right,g tued5:j zf( as shown in the accompanying diagram. Whicje:,zfd (u5 gth 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, rc6;,vrze n y7which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of spacen;rzv e7cr 6,y.

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 wir6kb2to-+kqr7+ pvls7bzfr0 re has a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indica-rkkv b2fo 07srtl p+q7+6r bztes 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 space so that the conventional current ink ;)n3xqjrj/ z 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 z/)n;xqj3 krjpage. 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-carrying wiiv:or8 a*n vkr-wv 3s2res are shown end on in the figure below. The wirar*-28 vnsv3i:v wk ore 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 neakag*qb1 18j-lcp vx /br a coil of wire. A conventional electrical current is then run through the coil fr1xb1vac/ - l8qpg jkb*om 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 thr(fo4 kx ix djvv, ft-0gpiv,8.ough point P inside the solenoid shown isp4- 8(igjfkx .d,x0tvvi fo,v
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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