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

1#

96.27: A long straight wire conteg3 jy 1(aiad3wd- 0nductor is placed below a compass. When the conventional current in the conductor is from south to north and large, tha3(j1 0t3anwgdei-yd e 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 i8 rc+fl kgy yaq34(nlafx:t; ;n half along the dotted lines shown. None of the pieces are rot;:qtf3rl+ y(gaclx4;akf 8ynated. 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 ihf4hpilm-y2gb f3 p9 :ron filings sprinkled around three permanent magnets. Pole R ighpm 29f ph4- l3fyi:bs 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 (positi bpzfj/5m9p a, r2omj0ve) electric current flows from left to right in a0op z/r2bjm f am5p9,j wire as shown in the 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 wd*4e,f w ami/:sa vqo:vz(nu.rt-;ijire from left to right as shown in the accompanying diagram. Which option best represents the direction of the mag-qwo .vun;,4*sar :f i :meajt/dv(iz netic 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, which representation of magj6lso1vzh ; 49vqmsd4n0 bc4;au euf)neti vn)b 1 a0 ;464cqejvzus4 so9dlfhu;mc field lines is inconsistent? The squares 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 conventional current direc-za6ab2m1tyxq s85 ozted into the plane of the page as shown in the figurmz- ox 2bzs5a ta86yq1e. Which one of 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 space so that the conventional current jrnqny4vg t2 /d131 rtw2cqw 7(vyf3bin 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 q1wr v 2g (ywnt4j3n1bc/t 2vq 7r3ydffrom 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-carr j yvex 3bvx+e2zy g. pz1-po-5uk2d8jying wires are shown end on in the figure below. The wirekzd y-y5 e- ovug2b3jz.j+8pvx21xpe 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 co9+fb,qqlrq(k oa8 h w7il of wire. A conventional electrical current is then run through the coil from le8fw b+9q , h(ra7qoqklft 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 lpytl )+gt1(n4 si enb-cjl6m8ine passing through point P inside the solenoid shown-8+sjtpentln( y g4)6cmb i1 l is
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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