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

1#

96.27: A long straight wiredyfra:h/uea0w6 lket3k2+j2ku0h1:c 7ar o y conductor is placed below a compass. When the conventional current in the conductor /: +kde1eaou:l2 f3r2aw 0h k y7ary0thku6cj 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 alonir322f abzi*++cxbuyd 3 aqg5u7uwc;g the dotted lines shown. None of the pieces are rotated. After th;r a7 dif 3 w2b+quci u5gbz2+uc3x*aye 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 depicyv+d 0- 6u*oc(tf6w yoknmv,rts iron filings sprinkled around three permanent *c 0m6 wydvo,rvf-(+n uyokt6 magnets. 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) electg;jr ;kb/ 6qo :m(jx e3droqe1ric current flows from left to right in a wire as shown in the diagram, what is the direction of thr o3reg (d jj:e1 xoq;b;6/qmke 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 w wf djk0sce(ysuig)1 k y(*s t:-eq24vire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic fielitegcs k1)w(:f4j vy0( eqkuyds*-s2 d 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, which represe /nou*7bh 7can uiu (9gb83ugtntation of magnetic field lines is inconsistent? The squab(/i7t7oh9 ua gu ncu38*u gnbres 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 planeh-x +a+hlmi.y of the page as shown in the ihx -l++ay .mhfigure. 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 inp dmrm)1v/ e kuk.g6v8 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 (aside from infinity) at which the magnet kkmv8m gr pv/1ue.d)6ic 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 are shown end on in the figure c7,ma9hua 5o fx3kwh 7jy)4h ubelow. coa4k7 ha)huwm jy5h7x93,f uThe 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 electpyr 8a p 0.e9 mz*vovizov,8,brical current is then run through the coil from left to right as shown. This will cause the 8z 9pa,z e8r.vyiv0pmo* ,vboNorth 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 ly .edgd x -ds1m1bd6zi9vg)0fine passing through point P inside the solenoid shown im zgf6d .11gbdv)0i9x-ddye ss
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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