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

1#

96.27: A long straight wire conductor is placed below a compass. When the p-u8:imlxsantj +t(d pl yf1l9, )n.iconventional cuni nlpsjlxt-u 81 pald,f+ )ym9:ti.(rrent in the conductor 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 along the dotted liz5km3wj8 vs) 3myztkt. rgm,.nes shown. None of the piecewk85.vmkz,jgmst3 ).tr yzm3s are rotated. 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 d33 z4t,tjz t*-owlbs9zym 8nuepicts iron filings sprinkled around three permanentmtzw j noz34 8tbltuyz3*- 9s, 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) electric current flogoq2sufh*wekf s 0dbr4k-s (8 m)3x sv1jm1 x2ws from left to right in a wire as shown in the dim 2s sdjk khu*8bxv sg1213xwfo fr(mq40)es-agram, what is 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 flows through a horizontal wire from left to r;dea9dla . hjtum1n7tx s 1+3oight as shown in the accompanying diagram. Which option best represents the direction of the magnetic field.hldteo t;+s1a9 dx3 ajnm1u 7 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 understan07v c,nig do*h 7p4wikding of physics, which representation of magnetic field lines is inconsistent? The squares in the diagramsi 7gow7ncp*4 v,d i0hk 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 h+s6c ctm f5:uhas a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic fiemch :s+f u6c5tld 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 saqwgj/ c(+5, pw( oqcupace 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 magnetic field is equal to zero from pug( (a5wc/c, qw+ qojthese 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 m3-gdi8qo-x tmxk a5gd486no figure below. The wire ond ni5got4g-o3 xdx8q8 - kamm6
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 w loj/leu c(qchwe38br:rl ;)) ire. A conventional electrical current is then run through the coil from left to right as ruw e/q(:j)rlb c hle;o3c8) lshown. 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 inside the solenoie ym2qu2*y0n. x*twiad shown isum2*atewy0 .y q2*x in
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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