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

1#

96.27: A long straight wire conductor is placed below a h:/3oz, 7lw69r wvi)oxlgh qicompass. When the conventional current in the conductw3oroqw)igi z9: h /hv6x7l l,or 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 lines shown. None ogv dce p6 30f9a 4l;wfa:yg*ecf the pieces are rotated. Ae3:ffv04 ldwc 9p6; aaec*yggfter 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 ru :-w eqsrc36qight depicts iron filings sprinkled around three permanent magnets. Pole R is thw squ3cr qe6-:e 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 leegnh1 1r b1ibii;:2mtft to right in a wire as shownnihi :b11gmeti 21r b; 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 horizxk- hzq5k; izub+ p1t:ontal wire from left to right as shown in the accompanying diagram. Which option best represents thktui 1q 5k;z zph+x-:be 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 representa dxivp 8)q8h6l7n: fkwkeag- ,tion of magnetic field lines is inconsistent? The squares in the diagrams below simply represent - :8kq)i7dak xev 86pnfl,wghregions 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 thh54c+zzxmo 3j lp5r l)j04z kde plane of the page as shown in the figure. Wl hj4p zzx 54klmrjc)0d+z5o3 hich 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 tha;r:q a eug,m gqdc-t28t the conventional current in the left wire (2 A) comes out of the plane of the page and the conventional current in the rig-qa g;, m2gteqd: 8cruht 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 wizi p-okd3)bsv x,dr8j;dv6,yres are shown end on in the figure below. The wirex68yi j3ov ,v;pzbd-rd k,d)s 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 oec/cl/cw5yp ddjp0h/6d9o f :)u0x 2dw mvpp7 f wire. A conventional electrical current/chd/e:d705dp 0p f2 xpwv cmcw/d69)lpo jyu is then run through the 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 P inside the solen*;:uv ppvp n; 3vic+s4hik.mgoid shown is hpp:*u vn4;i 3c. +vk;msi pvg
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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