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

1#

96.27: A long straight wi1e*+7ne0bg 1p8f jnj tdav2f- lzr g*yre conductor is placed below a compass. When the conventional current in the conductor is from south glafpfg1 nz*1r vb+nje0 8jtyd7 2-e*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 be cut in half along the dotted lines n rn4lcsl byb+/i4 /uhq ),n:oshown. None of the pieces are ro/ly q,b)44n/:+b l ninuoshr ctated. 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 three( o:f8e(vyamhw3+t b nl18bz t permanent magnets. Po+y vtezn3(8bh fo:8(amw 1tb lle 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 tos 1xfh+0xtdk+gznm x0cc)8 y1 right in a wire as shown in the diagram, what is th8y t0xnc1 x0)fzkd+m+ghc sx1e 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 from v: eb) * jtwi+rift*e:left to right as shown in the accompanying diagra*wb*itv)e r+j:e: ft im. Which 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, which representation ofs4k w,z9qf0)zkqh7o) mbucy; magnetic field lines is inconsistent? The squares in the diagrams belwhf0z q u4;ko,bcy)m qk )7z9sow 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 th9 1/theukmxz0e plane of the page as shown in thehu0tk e z1m/9x 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 fixed in space so that the conventional current i8tgb;o+egtp 9dfoj mb* 7(/x yn 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 Regiotbbd+ogy 8g7mt xep;jf (/o9* n(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 whrnzh .yr4;5sik1 xfc surjsj 93/k82(dft2 tires are shown end on in the figure below. The wire on(; dx52 s23yztrr/f9u1ss ktjhh8cfi k4j.n r
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 currefj)mbu/ t; fua e i*ob-i/l(0 7+djigpnt is then run through the coil from left to right as -mi/(l 7bdi+/e 0pjt*; uaibj )ugf foshown. 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 fie3:h a7vjnkq z0uq9t/yw 3m6xeld line passing through point P inside the solenoid shown huazvqkw 9/7 jy03m3tn: e6xqis
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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