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

1#

96.27: A long straightn+ y5 pj1xo8l4c +xpd+p zluc9 wire conductor is placed below a compass. When the conventi9c xjz84+cup+plol1np+ xd 5yonal current 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,7 sx ub5inm2q; c*hzy are to be cut in half along the dotted lines shown. None of the pieces aresu7xnh2q m ,z;*i cb5y 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 depicts ;v kpoew)m3)h iron filings sprinkled around three permanent mag wv)3m; okpeh)nets. 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 left t ,p:jpjcx8/we .5 owgyo right in a wire as shown in the diagram, what is the direction of tep/ yj go5p .8xjwwc:,he 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)sm+4-zq9vglzvk q7 k ire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magn-qzv m+)zv749gk ls qketic 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 temzwjqg(3n9 8t *e )crepresentation of magnetic field lines is inconsistent? The squares in the diagrams below simpt w)e nqm(z9jet8*cg3ly 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 wi rh8g t*q2ptvxm*j2(xr q+0jfls9a k.re has 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 field associated with this wire at the locati*2 fpjm q2 t +k9r qxal8(tjrs0xh*v.gon 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 conventiona;r ldf-b/ o iz x-lv+erb- kaa8l:9dq:l 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) goesbxq lzaefvk -l br:8+; o:ari--dl/9d 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 end o)-d6bsx:mgatjw ;,fpnq hi 43 n in the figure below. The x3m-), p 6qfw:bgdj tisa4hn; 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,q*omp) x.vbs2td t1s wire. A conventional electrical current is then run through the coil from left to right as shown. This will cause the North pole of the compass tosvb2)s qm*, po1tdxt.:

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 i t0a9rkx/l 1e7m8kr6m5d nr rmnside the solenoid shown is d8kmkm rr0n 7lr a5mxetr619/
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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