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

1#

96.27: A long straight wire conductor is placed below a compass. Whe6jrby,cys *m+n the conventional current in the conductor is from south to north acyj*y ,bms+r6 nd 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 dottey +uaz cbdm 7nnh*5 q6sw9cq7(d lines shown. None of the piecbn m95cuawznhc(7sqq 7*6 dy+ es 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 tl26tif+ +n pqahe right depicts iron filings sprinkled around three permanent magnets. Pole R +q2 +nfl6aipt 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 conventiona;p9vsrr.h5sk) -j wr ll (positive) electric current flows from left to right in a wire as shown in the diagram, what is the dirhrsj-w)r 59;vs .plkrection 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 lefttn4w o ,zj) a)e8h;vnl to right as shown in the accompanying diagram. Which option best represents ;4j, anv)t)8hezwlonthe 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 understkyuo(t ej,vi p5.q1 3uh0 )pvfanding of physics, which representation of magnetic field lines is inconsistent? The squares in the diuy. 0 p35,u k fvjev1tp(qh)ioagrams 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 corb2gh7ytjg4a3sg5d;8 u km a *nventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indgd37gt8 j2* k;ha4surm5gabyicates 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- qz-ees9 zz 9l;p)ehpijf 2uwm;7l )x are 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 the right wire (3 A) goes into the plane of the page. In zw9-p7ezepelijsl-2q fh);)z x9 ;mu 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 currentfhe p,8; 71s1ag; w8ovrlnvbr-carrying wires are shown end on in the figure below. The wire on r1f1 8vgo7ls;bahp8wn,e; vr
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 electricauq b(gxub:rea 83wrx.nz w ;71l current is then run through the coil from left to rixxq87(aeu:w;w1b bzug 3.n rr ght 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 poidjg d*c.hnj 18v9dh2dnt P inside the solenoid shown1 nd.29dvh8*dd jgjch is
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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