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

1#

96.27: A long straight wire conductor is placed below a compan** thzo4 c(fsss. When the conventional current in the conductor is from south to north and large, the N p (hst* zfocn4*ole 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 shown. g,we k- 2j-cufNone of the pieces are rotjcf,wk 2u-ge-ated. 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 per 8ljpv6 mf x+rs8df3/amanent8 sf8/dpjm 63 x+lrfav 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 fromk,h rp:hv30s l left to right in a wire as sh3r hsp0,vh l:kown in the diagram, what is the 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 left to right a*j-df enj*vgza.gbs m3+bhw-mu b/+4s shown in the accompanyinsg-/j b+*bu h+fv jzega*mnd-.b4m3w g 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 currenttzbe,bzdtcmi:-n;8lw8 ts.3 /no zs6 understanding of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions of spat8zb6nec/83 ,i tz -sb. lmzownts :d;ce.

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 toja c-x ea107oy bv82ehe plane of the page as shown in thj 8voxab2yo7 e1-e0ac e 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 uicx 0i+c,b0gl6hof r4)3 dunspace 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 which Region(s) is t0l6 u,c+nc3f 0gbhxii)ou4d rhere 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-t8e, ix7ycm7ykss -1 dcarrying wires are shown end on in the figure below. The wire on 1dyk-x7ey7 is cs,mt 8
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. 9w89ey6; 4djp faooi,mhj p5a A conventional electrical current is then run through t48ewjoaja o ,imy9phdf6p9;5 he 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 thrndg8a4 wu; wo3y8ifu0v0z r1oe dq t88ough point P inside the solenoid shown is y 8 grvw; 8 n013fid8 e0auotwu4zqdo8
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{μ_{0}}{ε_{0}}}

= 377. What is the unit of this quantity?

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