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

1#

96.27: A long straight wire conductor is placed below a compasscdag9 *hl- a4fjwq., d. When the conventional current in the conductor is from south 9 a, wl-agdjdc4h.q* fto 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*7scv4m7t4e(z /kv z7wcak tl dotted lines shown. None of the pieces are rotated. After (cemwtkk7z7t4*vzs7 l /a4cvthe 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 depictqavb-q :f9-l 8jv*1sju 6u*hvz;d rjfs iron filings sprinkled around three permanent magnets. Pole R is thehrb6*-qvv: v a*91jf8uqzluf js;j- d 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) eleclmxvg lhact; i4j73o0)j qdt ,: t83vztric current flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic field at point P? ;q, 3 4x0jd:ltvojgtalvm)z3t78 c hi

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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 culdn 7bvd 6j5*ch(c)a c g:)u edjgh64grrent flows 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 point nbe)6ccdd)5ag6 jv(u:g hghjcl d *47 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 rep/ bk esyi)pa.-cz yh pe7-1kw-resentation of magnetic field lines is inconsistent? The squares in the diagrams belowpzb1p-/).yysw a7- eikh kce- 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 directed into the plane oj, ;teixtvji-us r5 30f the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wire at the location labeled s tt,ir 3;0j5vjxu-eiP?

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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 conl3i 87.zqmj-(wb sdehd:b4 r uventional 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 currqbmu8 d jbz-r (i43we.d7s:l hents?

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-carryinxpyxv ay+-kd) 1 -)fjt pi7pf)g wires are shown end on in the figure below. The - yppv1)xf+if ) ka)7 dxjpty-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 conkjqjle slf1 -dyr)o9uxz4;(9 ventional electrical current is then run through the coil from left to right as shown. This will cause the North pole of the compass to:z)9 (sjrd;jeo9 qulxkf14 -yl

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 solenoid shov 4buxgzq3sd,5*h:h swn isssh x g d5b,vh4zu:3q*
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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