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

1#

96.27: A long straight wire conductor is placed below a compass. Whe pq5ed7 wer,rrfg.6 0en the conventioqfr wred,ee.5p76 r0 gnal 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 are to be cut in half along the dotted lines shown. Nodmxp;6 /t qdh1z..y vqne of the pieces are rv/1x q. dhyp dmz.;q6totated. 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 iron f8lpj9gvk0s( oilings sprinkled around three permanent magnets. Pole R is the slkpg j0(8o 9vsame 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 (positp cwc54 4fcgyigsh3 wh30i* 8yive) electric current flows from left to right in a wire wwsg3cchy4pigh4fiy53 8* c0 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 wire from lqy76( qx 2jcp hs60uhpot7 xqu;gr.7neft to right as shown in the accompanying diagram. Which option best represents the direction of the magn7hh 72ojp0uqq(c6.n7 sxxq;6 pyg rut etic 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 reprscb*) 4z ozat(reb9agss9g d*6jc78vesentation of magnetic field lines is inconsistent? The squares in tsj e*gzzg4 o96 ac7 cdb9b)s(*ravs8 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 cur)8nt 5ixozot 3rent directed into the plane of ox 8)3titz5no 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 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 ib4rerw+b5kgq8/of 9 vn 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 into the plane of the page. In which Region(s) is there a place on the x-axis (aside from infinity) at which5w9fk r ovb8/qge+b4r 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-carm5f onrer8;bm p+6bb 6rying wires are shown end on in the figure belowf m6ombbep65n+ ;rbr 8. The 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 n 2y .hrx7.pd9zvopvjp9.+agnear a coil of wire. A conventional electrical current is then run through the coil from left tovg o7nrj zp9v.y9p. 2+ap.hx d 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 tlhum20,b qon0hrough point P inside the solenoid shown is lb u2o,0n0h qm
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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