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

1#

96.27: A long straight wire conductor is placed below a compass. W.v 7t* / x*bbzyh)qtha4p5jjy hen the conventional current in the conductor ixt.h5 q j)h4/a p*yyv bj*tb7zs 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. N;g-w a 9y4ccxsone of the pieces are rotated. After th x;s yagcc-w49e 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 sprinkledcbi: 6 igh-/+h9adwhn around three permanent magnets. Pold i/gi +c-n 9a:hbh6hwe 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 (posi /e k,-syjccg+tive) electric current flows from left to right in a wire as shown in the diagram, whae -,+yc gjs/ckt 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 wf/m-v d1rr4b d9ejmg sj (/9bqvtk2(from left to right as shown in the accompanying diagram. Which option best re-vmk(v/qm jb4s(9tr2e 1 j/ r wgf9dbdpresents 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 undersz9qf d7mbe0:o*qm( 9qk fy1vq tanding of physics, which representation of magnetic field lines is inconsistent? The squar :d1o(vq mqmf7b e99q*k0yq fzes 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 conventionalv3 8up71zuref 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 location labeled P? epf38v1u u rz7

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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 fix27 uc rkyzq3p(bm cv5q u-n61ns3th0red in space so that the conventional current in the left wire (2 A) comes out of pnqc7 s26rb( murn3503y-tu1zhc kvq 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 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 on in the figure belowviglx,130 bh v. Tg,3v10b vhxli he 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 x3kxo(e :7bfioqg*q +coil of wire. A conventional electrical current is then run through the coil from left to right as shown. This will cause t* ob 73gqqxo+ik(x f:ehe 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 throi g 4av(7tbi9p( fx7pdugh point P inside the solenoid shown is 4 79i(pv (bgfi7ptxad
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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