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

1#

96.27: A long straight wire con *wi56n2,a8 xajscn4bxx s; qfductor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N po,5q fjx2b6 *anwiscaxnx4 ;s8 le 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 sho,q9pnb)f :q cbyf(:a5 u antt.wn. None of the pieces are rotatedq,f5 cn9tay bf:t qb(u p:)n.a. 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 depicts iron filings sprinet*snqms z /)omyt l kp-a(6 0rqwy- 3oe(ek6(kled around three permanent magnets. Pole R is the samemqm/(e0)qtk6*syzos k (3wp e-a ( e-6ltnyro 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) electriccrve th0 )uk5u- d(gq5 current flows from left to right in a wire as shown in the diagram, what rdug 5tve)h0k5( uq-cis 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 flowsm2mm)6d q+ g wf4e:1civa- rlamt/d(s through a horizontal wire from left to right as shown in the accompanying diaggq+4wdt a2ad imlv)r m :6mms(1f-e /cram. Which option best represents 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 understanding of physics, wh*9r0g m/ npgfdjsx/ *zich representation of magnetic field lines is inconsistent? The squares in the diagrams below simply /9r*z* pm 0fgjgndsx/ 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 convd )/ m. 1sgzzia1kxvav o6.a1bentional current directed into the plane of the page as shown in ziok1gd6a. )m.b /a1 xvszva1the 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 io0+ 19gx hblupdbq. y(twbv.mb n,5 7tn space so that the 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 m .nvhop,0u17tldt (.bbgwbyx5b9 q+(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 wir1) sys4ry84kxqdzhga+i-* a oes are shown end on in the figure below. q+h- kz)4y gy *ai1ss8d4xoarThe 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 conventihw z:u3:c yvc** uy0euonal electrical current is then run through the h3uyezc: *y0u*vcw :ucoil 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 pi(utd8z u,h e9- he- nrcltxqp zu+;,if1kw 81assing through point P inside the solenoid shown is eh+1,8l 1u-p i k wfhczt, ezi9nu8rx-tq ;(du
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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