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

1#

96.27: A long straight wire conductor is placed below a compasohyn.* p m2 1p lwng7m*/e-tqtj)(mees. When the conventional current in the conductor is e.epemy*mqn wjltg*/o 1tp(7 mnh-)2 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 gjz*wiqf 44/ olines shown. None of the pieces are rotated. ojq*4w/fg z i4After 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 they,k2ysp 6/mon right depicts iron filings sprinkled around three permanent magnets. Pole R is the same y6 on,m2psyk /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 to right in+l7: s:lt/ qw.0f mcyz+khyuvu0s.xw a wire as shown in the diagram, what is the direction of the magnetic fiehy 0 0zx.cmutv. w lsqs+ wlyk:7u+f/:ld 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 hor-no tg hu;tv0bpe,2 h8 q fq0sg8e-+tmizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction ,gbgtu08 h-n;2t8eq+p0mthqvof se - 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 physics* qzyks8zwvr )j.l6,h9a gb/ k, which representation of magnetic field lines is inconsistent? The squares is zykk*hl jgw z,8vrb) /q.6a9n 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 current dir ;xukp1 *6k*fs8jwma jv6zqt6ected 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 kts z*j6fp6ju*vkw1xm 6 8a;q 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 fi5*;em4 en;i su*qpbvyo 5r b qws+k11uxed 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*e4 1s1 ur;qynib+5o ekuvms; p* 5bwq 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 wireiqq )3p+psx7ppxn / s-s are shown end on in the figure below. The wirexs) 3/isx +npp-p7 qqp 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 conventional elecexd boxj6;t9j9z42.kf yg0khtrical current is then run throu2zhk kox 0b 6tgjx9d;9y4. fejgh the coil from left to 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 through point P inside the solenoid show c;osy/ 8zvs46 ipank.n is ;cy4ipz8s k o6asn/v.
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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