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

1#

96.27: A long straight wire conductor is placed belo hv3bqw;2z)mhkrq l ahb(0:e8 w a compass. When the conventional current in the conductor is from south to north and large, the N pole of the cor w(:2h)0;hqmkvabh ze8lb 3q mpass:

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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 lines sho ;94r hc2v*ts f2kyrote. hwqy) *te;jwn. None of the piec*qy.rr4tv h)h *y;;9teosckfw 2tj2e es 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 depicts:o jc.vxhq3w ;+ 4nibc iron filings sprinkled around three permanent ma. nc+:3h4xj oqb wci;vgnets. 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 conventionax6hz 4q kb qccn8er)3+l (positive) electric current flows from left to right in a46 ce zqx8n c+q3kbrh) wire as shown in the diagram, 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 wi5wqov9n0p,. qc pnao5qrh1ul. . 0ufe0ljkg: re from left to right as shown in the accompanying diagram. Which option best repre0lf0 .g.j0 1ap5lk5 :nocweoqn9r.vpquhu, qsents 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 +x*l gkkn1x4 r(o vvt2physics, which representation of magnetic field lines is inconsistent? The squares in the v42o vgxk*n(l1+rkxtdiagrams 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 plb+mnvms.ximh)m+z.b u- u1n(;*sk clane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associl vm. ; mnucm*+-)mnz(.huis k+x 1bsbated 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 arym0 zsl or*(6opp+ 9ake fixed in 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 into6sk* ormplpy9+0z(a o 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 curr/o+rhlj na8iso; ,s)p 6/is,tkub8z x ent-carrying wires are shown end on in the figure below. The wiri88,z/;nktpl6 ra o/h )sbj,+sxuosie 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. o2uld5ddr:z/a o y6q,wf2k 3 nA conventional electrical current is then run through the coil from left to right as sh /,lwdq2u: 3rk dzn oad62ofy5own. 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 thr4// akdd e0j /sy*s+2 lzeyalkough point P inside the solenoid shownlakda s2l*k +y/s/4 /j 0yeezd is
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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