magnet and magnetic field lines - 无忧得胜-网上国际课程 (5edu.win)

1#

96.27: A long straight wire conductor is pl7aq5 ta,o1dfi mt4 m4saced below a compass. When the conventional current in the conductor is from south to north and large, the N pole of fs q5 at47dotm14i ,amthe 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 lin() +wzapt*8 xs1epr j)jsvxp 0es shown. None of the pieces are rotat) xsw)pe0ppj1r t v(sjxaz8*+ed. 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 thrwm 7, dwjxohino x- y,rtb68)qkel649 8xadw. ee permanent magnets. Pole R is the shnyd4ow. iekx-ow9wj,x6m87)xblq ad6 ,8rtame 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 le2sb uiw ,j*rg3ft to right in a wire as shown in the diagram, wi*,r bg23 ujswhat 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 lefi.:p 6ksop cix:r1u4dt to right as shown in the accompanying diagram. Which option best represents the direction of the magnetpp: : urcixio1k4 s.6dic 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 unders2;/5-lvn w7inz, olzxgpu ryd11w cu2tanding of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply u/g2l2,7vx-lrz 1czpi1n ;u nd5owyw 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 conventize *x7ry 7; (jt/yu4ajrnf,ikonal current directed into the plane of the page as shown in the figure. Which one of aikzy yn/t(,fju4jr;*7 7rex 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 in sug5 kbsr,-phy) ws1- (qwf) nlpace 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 which the magnetic field is e1)gnqyp -ls rbsk- ,)w(wuf5hqual 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 curr46 x w1pojcja5g9kif ;ent-carrying wires are shown end on in the figure below. The wire on 46k 9igjoaj ;xwp5 f1c
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 plac214um7fzloau ons 7( zed near a coil of wire. A conventional electrical current is then run through the coil from left suz1ufzlm27n7o(o4 ato 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 k3 ym+7rhku k c0qw;2;ez8lt7 k2 8wa8adanmxP inside the solenoid shown is+zmq0mua r7xl8hk3ea2 k7d w8;cn;k 28ywkta
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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