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

1#

96.27: A long straight wire co-fpa8) e t*1+pfhdh winductor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of dhtph8-) p1 *a+ewfi fthe 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 i ,-jwit9)fe ,* hxuhvry35cvvn half along the dotted lines shown. None of the pieces are rotated. After te5ijvvx 9- chv r ,)hwfty,*3uhe 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 toynl1s 9;k 9rax the right depicts iron filings sprinkled around three permanent magnets. Pole R is the same as9r 1kxy;la9 sn 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) el-h0 .dsxzvlor6 wxgz .e/s5d:ectric current flows from left to right in a wire as shown in the diagram, what is t.d6z/gz.5olewx dh: -r0xs s vhe 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 rg yqb/,cz2y4 through a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at poin,y2gr ycz4 q/bt 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 of h:iusdqz ; a-sk2lg7p)a q0cx99(na cmagnetic field lines is inconsistent? The squares in the diagrams below simpp xn uq-scd2 a lzaqkahc:9; (is09)7gly 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 convebr (i zt;:7 httxwil:hck89 /antional current directed into the plane of the page as shown in the figure. Which one of the arrows showr7xkh:/( tiw;hzt9a8b itc :l n 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 theb4l:s32 zt,+ vxg qzju 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 there a place on the x-axis (aside from infinity) at which the magnetic field is equal to zero from these t zjgsvq4 xz3bl+,:2ucurrents?

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-carpv4u8fdrrx)db6 he9am:bc* c0i2 pm +rying wires are shown end on in the figure below. u d c):9fx+ vd 4*p8mpr62ahbicer bm0The 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 electr i f;npn.1:3wcw c66lzwz43 sqtet5drical current is then run through the coil from left to right as shown. This 5zlw q w1etdc6s3 zr:fi n.w4t6pc;n3will 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 solenob 9 + d9fdppfwc:; 2ysykv..laid shown v ..ldp; dwc9s2kfpa9y+ :byfis
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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