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

1#

96.27: A long straight wire cp l 8ax.sbku4y/gs)8ymzg45nonductor is placed below a compass. When the conventional current gxzpbs4. 8 ag sy 5/)umy4n8klin the 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 lines shown. Non,h /, ud7 7kmmja3 so lzqn)/ygyxx0a,e of th, loq3aaym/7x,xsy dju0z m/7k,hn) ge pieces 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 the right depdkocl8(x+i zaph2)q p57lu46 dje cm3icts iron filings sprinkled around three permanent magnets. Pole R is tkd(3i 8hauc56jl4ppqdxle 7z)oc m2 +he 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 fbz+vhamxhu+.e9l . t9 i- mrf1lows from left to right in a wire as sh1u9 +z l.hm9+ir af etm.h-bxvown 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 nj8hx p4fuy /r b9g:cgvx93g4h2aqz4from left to right as shown in the accompanying diagram. Which option best repre9af vq x yh uz84bp3cn92/4grhxj4gg:sents 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 understczd lg( dbz m83qf)uw;kd3q,c ge,;h-anding of physics, which representation of magnetic bqd-; whu;dczd3gzgeq,,l8fcm 3( ) k field lines is inconsistent? 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 direcge;l+:qdse. dix)q2 sz y5x;wted into the plane of the page as shown in the figure. Which one of the arrows selyq;dxx;e2)+wzi d 5:sg q.s hown 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 that the ls:(bmeub s1)c x5v7( lc3oy jconventional 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) goesm1cb75x: l(os (y3be)sv jucl 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 aub/le/(-dc*x 2;v dph5zexm 00wbdimre shown end on in the figure below. The w20dd;w mmip*xe v/edh-5/ 0(bcx buzlire 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 conven oz6n(s1e p slcap2 +8x dm.h5vwzv-2ntional electrical current is thhxm za+pcs (ov2sz5-dl. 2 v1 nw8e6npen 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 solenoiy;m*fyh/m rs8d shown i*s;fym/8hy mr s
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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