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

1#

96.27: A long straight wire conductor is placed below a compass. When the convenrl z 2)ees*q,9c dq1tw 8h4fzxsr)o,ftional current in the conductor is from south to north and largesr8h4r qf l9eq* z21dswfeco, tz),)x, 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 showcukc7ojgin3 e+onyk; ;.;m,jn. None of the pieces areuye io37;,jnkmc;k ocnj; .+g 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 sprieb6x/ jh8w w i aww+et2xk4);knkled around three permanent ma)e+ 6 aewtjw 4b2whik8xkxw;/gnets. 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 rigyxdxg cgf; 7pxi::8t9ht in a wire as shownxxi c g:d:7;px9g8y ft in the diagram, what is the direction 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 afn o.xk,9u4x from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic fielu.okx, xan f49d 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 understanding5d dak7f4m cd- of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of da-7 kmd54dcfspace.

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 plantijf33sb;6 xi e of the page as shown in the figure. Which one of the arrows shown best indicates the direc;ifjbt 6is33 xtion 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 m 4tib,j:citg:0u gsw sg(9(-.uqztk 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 thk zm-tu 4bss09iwjiggg(: .uc : ,(ttqe 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-carry6lemfs9o 8q4oing wires are shown end on in the figure below. The 98sm 4loeoqf6 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 vdqr 0n+c.9vba coil of wire. A conventional electrical current is then run through the coil from left9 vdv+.r bqc0n 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 through poinla/ls /xpi08: riw:ont P inside the solenoid shown is a/ol n:piil0xsr :w8 /
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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