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

1#

96.27: A long straight wire conductor is placed below a compass. Wh:h:w e jd8+bvyen the conventional current in the conductor is from south to north and larjyb+e :h:vdw8ge, 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 j3t .gq5t8yma9.q 5tw :zxg jzcut in half along the dotted lines shown. None of the pieces are rotated. After 35xya9zmgjqj :t. gz.qt8wt5 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 sprinkled around three pen-tqos3 2ja2os( ;jo lrmanjo3l2 ajs (;nqos2o-tent 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 flows from le,9ij8 urjck:p ft to right in a wire as shown in the diagram, what is the direction of the magnetic fiep:kr8i,jcj u9 ld 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 nxm,l )+w0h8bxb dt w js( 4rhhy4,a5uthrough a horizontal wire from left to right as show4 wm(l w tjbs u +nbdr,h8)hx5,40xyhan in the accompanying diagram. 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, which representation zkzrqoh0h1; vne0,d th8 r/vj( k,j)lof magnetic field linlendt ); 1 hkvqvo(r0z,h,0kjj 8z/rhes is inconsistent? 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 plane dz3h5e5t 1hkx n r6sb9of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wire at th93h56 5xnzerhst1 bkde 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 thehbr.z ui g+9;c conventional current in the left wire (2 A) comes out of the plane of the page and the conventional current in the right whu.z ;b9cirg +ire (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-carrying wires are shown t;2uh xj if435;c.rcuy binktl((t; dend on in the figure below. The tt u(ldb2;fu i5x(;nkh c 4cr.;jti3y 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 ele4,dygiz b ov+:p)swsu0 2/dgdctrical current is then run throu/:s yiw 4s +g,vu)dz 0db2dgopgh 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 inside thep4q,vvx *gr6 m solenoid shown vq,4 r*6mgxvpis
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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