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

1#

96.27: A long straight wire conduc21- no)dvgl9f ul2gpntor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N plopn)und9gv2l1f -g 2ole 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 hajtz2*ps(0eu zlf along the dotted lines shown. None of the pieces are rotated. After theu e(0*t 2zzpsj 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 righ 4bx46iwvr b8;(lsprp t depicts iron filings sprinkled around three permanent mag(p84 bvr;wr4i6lxb spnets. 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 curd d6gb bb/r,5wrent flows from left to right in a wire as shown in the diagram, what is the direction of t,5brbdbw6/g dhe 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 ho+q5;bpo3yr3s) gggc g 7.rtxwrizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at pointgcgp +)yrs;b .g5og tw3r q7x3 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, w84*9v*,a 6 s y/xhnjmse9 x5 wycgkzrdhich representation of magnetic field lines is ince/8 5y *4kdavcysxgn 9 sh*,mwx9rjz6onsistent? 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 directed into the planeco6)jk(d yme5 of the page as shownjk)mc o d56(ey 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 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 conventi)62mw 2.zy jzaarl(gc q2l7xj onal current in the left wire (2 A) comes out ozl6x)lmr azg(qc w2j2a 2.j7yf 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 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-carryi 80mrv*ml qhfoyz a:u(x r958xng wires are shown end on in the figure below. The wire ozu8mmrf yx8l( 09 rx: hq5*avon
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 ez0n0lre9gfh(a:n7sh d 4hz e ;lectrical current ihfln egr:(h ;e0s 4 an9z70zdhs 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 insidhib: nei+o kjxv c++:hl-*3n sg ,wef)e the solenoid shown ie+n+g+ hjo,):i*- lnxf: kisw bec3hv 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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