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 cy* ,dz 9.wnmhconventional current in zd*hcn ywm,.9the 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 are to be cut in half along the dotted acjmmp)/9mh/g ):ibu lines shown. None of the pieces are chbu):ipam/g 9)m mj/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 d)3:m ixjot0 (ml(,e0xee3o vg0q7 ytkw) uyygepicts iron filings sprinkled around three permane7k e0yvmqj) xg3w3youtmoxte(: ),l0 ( gei y0nt magnets. 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 ri vl4r1xjino+ 6ght in a wire as shown in the diagram, what is the direction of the mag r4xn6 jolv1+inetic 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 horizor4p/ 3bw uhvf.74avz lntal wire from left to right as shown inp/ulhwa f47b.v3z v 4r the accompanying diagram. 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 physicpy * g0egan e3a7(o3zds, which representation of magnetic field lines is inconsisten 7aezggpe a(dn0 yo*33t? The squares in 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(fj+ z- tqs6zmm4nv,xjc5n v)q:3msy directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the d my n3 vnmx:, ztq5f+()qc4jv6m-sz sjirection 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 sx(8gq -hyme c+.+),vc bmz1a 4dxczhb u-krx*pace so that the conventional current in the left wire (2 A) com8 vh* , -x1abcyezcux(x)g-rdzmmq 4k b h+c+.es 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 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 a*2*fr rd*l rxfigure below. Therd r*fx*2l *ra 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 7ej+5 ch(g-.dtfkl*fu i7ncg coil of wire. A conventional electrical current is then run through the gdce+ijf*77g t k lf-nuch(5.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 d *5wk:8 i r(aul* k+ucswv6fkP inside the solenoid shown isa*kuu6:8f kw+r s5kd(lic *wv
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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