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

1#

96.27: A long straight wire conductor is placed below bzo ikw)+m4 m vbw/j*u8 shb)5a compass. When the conventional current in the conductor is from sou)um)bz/ vhw*5 mosb 8+kji b4wth 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 lfc*vl *coy ),2ofb2lu * ca9jnines shown. None of the pieces are r*cu,c*9yovlcb 2 2 a*ff)noljotated. 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 arc )f9-rxj)qyd ound three permanent magnets. Pole R is the sa fjc)r 9yd)-xqme 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) elj p2-jqy*x /rtgs2mm(o* /nklectric current flows from left to right in a wire as shown in the diagram, what is the dsjtlopk r x/ymm*j/n2q*2 -(girection 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 frms hd1wymv66srul/0 hv /i u81om left to right as shown in the accompanying diagram. Which option best represents the direction of tvy//ummuvhhw10 dls68 1 6 rishe 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 /7 t /9ld7wezzgyfdx, of magnetic field lines is inconsistent? The squares iefy w7zt 7xdg/,/ 9zldn 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 c.zokc4xx g o9,(e(xq)* vqbmf 51zp ngonventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wire at the location labelf*mvbqx4,pg xkno z(1z x .5c)oe(gq9ed 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,.xv;d18:n.grh ek gv ue8izq in the left wire (2 A) comes out of the plane of the page and the conventional current inv.ee rgv ,qkd8;.g8n iuhx:z 1 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 fig/(pk s(g4uc,sp gw 7eivg/bq/ure below. Th,gscwk(g(is7/4 // bpqpge v ue 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 xb4w/w 2w;jl 1(pyljh current is then run through the coil from left to right as shown. This will cause the North pole of the compass toxlw(j /whl;w pyb4j21 :

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 insidoz,eh jek5 4:ze the solenoid shown is4jo:ehzk5e, z
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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