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

1#

96.27: A long straight wire conductor (,niyf k/ 1 *rx g0scqi.d2k akz31bqdis placed below a compass. When the conventional current in the conductor is from south to north and 1kxqn sdy01di*,ik .qbzarg(2f3 k c/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 linef z4h q, i5c/f/ieax/as shown. None of the piece/ezxaffic5/ hi/, 4qa s 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 iron filings sprinkled around three pe+b pgck( stkq-4m: m-hus+ 4xhrmanent mac -b k: umhg4pts sm4+xqh-k(+gnets. 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 curre1k0 dpbm69guv nt flows from left to right in a wire as shown in the diagram, what9m ukg6p0dv1 b 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 flowmc x+ey a9 zjnhu(l3bsw9o689s through a horizontal wire from left to right as shown in the accompanying diagram. Which 9x938c (a e 6 bnmy9suj+wohzloption 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 ofsa n/j d38,*ha gya ;;k3hrzuj physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams bel*y3aj38u;z ,jsrdkhanhag;/ow 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 pkly ze4e ad2yd/2f 66of the page as shown in the figure. Which one of the arrows shown best indicates the direction a2/ykefy e6d2d6 p z4lof 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 in space so that the conventional currc6 lg1ob :se:nent in the left wire (2 A) comesn:bgsoec :l 61 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 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 3ul ueup;w9x ,the figure below. The wi w9,;uupulex3re 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 conventio 4c, 8euui6.y5ock()cbo wn wznal electrical current is then run through the coil from left to righ k(5y4cc6coi wwo n,b8 .uz)eut 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 poi68q qi)a8((hf opyxzbnt P inside the solenoid shown is z(f6 o)x8(hqy ipa8bq
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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