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

1#

96.27: A long straight wire cond:2h i.9 m bvvuvw 8cyamb 84a1:roh5jnuctor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of the compb:9uvm.bi4vhmh 1:yw r vj8 5aao8 2cnass:

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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 theoy5u inpm 3ppp,1hf ,u(7nz7a dotted lines shown. None of the pieces are ry3f(imhnp pap, 1ou 7 5z7unp,otated. 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 tnnr5h7ymh;di4tjs1o;6f w8ty f.0hl t(o5da he right depicts iron filings sprinkled around three permanent magnets. Pod1h l5(odwt tffsja 07m.8hoi5 4h6;n;ryynt le 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 current flows from left to rigqga) ,x1xk5 s*cqd- apm4b8o 1t nsn-yht in a wire as shown in thsbcxq-q)o satn 1xdg8,y *pkm-4 a 51ne 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 lye9-ix cvjcn6.bff s4 p.(xx2 0 efo5keft to right as shown in the accompanying diagram. Which o( ypv-e enscjxxf2c 50kxb9ffi.46o.ption 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 o4 xjnhep p,)g6md/ q,sf physics, which representation of magnetic field lines is inconsistent? The squares g qh/ne ,ppd,s)4xj m6in 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 ;n* j4ry,fhhocurrent 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 hrnhyj *;,of4 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 arw-*fha)rkud)piz 2.j e fixed 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 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 infi kz)p*wf2 ud.)ha -rjinity) 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-carq.gu7loyc nzyx oi dqqar7:pfn+(6u v. *(n8+rying wires are shown end on in the figure below. The nc+n.iy8u x plq7 7ou((f *zoqnq6+r.yg:dva 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 coilc 2o s84kqzrt5 of wire. A conventional electrical current is then run through the coil from left to righqkr 8t4c2 z5sot 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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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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 li+/:s b, cwcdilne passing through point P inside the solenoid shown is wl+: dbs,cic/
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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