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

1#

96.27: A long straightnbfif23c/n* r wire conductor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N pol 3f2bi/ nnr*cfe 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 aresq.9e2ej zfqfqn,n 524 y 7gxb to be cut in half along the dotted lines shown. None of the piesn5qf y7fgjexe bn29.2zq 4q,ces 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 depicts7nxkq rl5cdg ;d*x+o 7 nh)9il iron filings sprinkled around three permanent magnets. Pole R is the sam+n h 7cgixdqn7l5r*9kdl );xoe 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 currwq- d1en9kgh.ent flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic field at point P?n9h.ge -k qw1d

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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 bkyd f.ui *r-.right as shown in the accompanying diagram. Which option best represents the direction of thefdy*ir.. b- uk 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, which repf(crz2di2u if:4 j pk4resentation of magnetic field lines is inconsistent? The squares in i (f:p2k ru4 cj2ifd4zthe 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 intodzm -i /l ,d6ry4r,yrd the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wirerl,ry d6, zird- m4/yd 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 convent5 am3bjb e 10jpt5l2xm 3nlq*xional 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 flb b3j025jp35*ql emtnm1xx a rom 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 ark puat 7k,2+k .,clozue shown end on in the figure below. The lu,, z72 kk.oat ckpu+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 placeqb dg7l87uzj l sacw a.67 ko,j, eduwx)h90i8d near a coil of wire. A conventional electrical current is then run through the coil from left to right ashcka89jd0ibz,o w7au .qe jdwg, s76u7 lx l)8 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 throuhv,av(olpm3* 7r77yssmah x (gh point P inside the solenoid shown ,yh v3ss*mh pxam(a( 77or l7vis
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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