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 cond.1c ftokocn hvl4a 7 r6rnra,(.xn; -ventional current in the conv ;t aak(n-n4or ,o .nfhclrd7rx16.cductor 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 are to bepw4z +/h e.b / vdz-lphtjhy s*o-,l:l cut in half along the dotted lines shown. None of the pz+:b w .ph4,-p/ehsh ly l/oz-tjdl*vieces 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 tzg:jc4)slh1 p 4y3chf48qj6t ocs6 yright depicts iron filings sprinkled around three permanent magnets. Pole R is the l 44ys46f o3cjy: tcp thqzj 1sh86)cgsame 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) + /kgj09myzcrdjt o. u8ow0+r8ianf0 h 78hyaelectric current flows from left to right in a wire as shown in the diagram, what is the directior7own98c+/k0hy 8aa08hf dojt0 m +yg jr.uzi n 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 lyf i*m dtrr5; nopwu l43nf().eft to right as shown in the accompanying diagram. Which option best represents the directirfflin.wn 3p*r o 5)dty(4m u;on 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 understand t(adho 0s tawb4mff:7- 0vpe7ing of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply repr f7wpfvo-7 04ase tmdthb:a0(esent 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 intor;jt waz3- gz3 the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direct t-w3 zaz3rj;gion 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 ztkkjy+ns6 9 jx5,5owconventional current in the left wire (2 A) comes out of the plane of the page and the conventiona+yto5n6jzwxkk9j 5 ,sl 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-carrs 7v9v4y sr+g 55dnfytying wires are shown end on in the figure below.5 sfs7d n+g5trv 9yyv4 The 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 conventional electrical curro1g;w ita+fy. ent is thewag; f 1t+yio.n run 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 through point P inside the sol73za u+)hz7-cvk) 4tvm hzrrq enoid shown is zh)-arc 3vvqz 4+mu7t r7h)zk
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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