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

1#

96.27: A long straighhgi *g*2xp- lyt wire conductor is placed below a compass. When the conventional current in the conductor is from souti2g-p**ygx l hh 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 ck*.yz rsc6c1 lut in half along the dotted lines shown. None of the pieces are rotated. After the cut:y *sk 6r1czlc.

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 iron1bflmi90lve + ekw:m, filings sprinkled around three permanent magnets. Pole R i+e9kmvwfe0lm 1 bli:,s 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 currhy2,dduld mf;+6kr-f2n a;ex:. aaeqcq7z 4eent flows from left to right in a wire as shown in the diagram, what is the direcf2dndk-e;y 6 qf h4:,l;+mr xd qu2c.aeeza7ation 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 throughr0 w1lbt ea05wb.ft6v a horizontal wire from left to right as shown in the accompanying diagram. Which opt 0tbr 5vwf.lab1ew06tion 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 of physics, which representatsa1* lqsvd j5:ion of magnetic field lines is inconsistent? The squares in the diag5lq:sj v a*s1drams 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 rkaoj3on +6beug9iwg/u6jvgl p 5( 8.a conventional current directed into the plane of the page as shown in the figure. Which one o 8buv.kj jn w66i9+ ueg5or/( ogglp3af 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 conventioig11i4,* 1lu 2zin cwm -xvv*vbbr;t znal current in the left wire (2 A) comes out of the plan lgm bxzu4-wr 1*zi; 1v1,i*ntc 2bivve 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-carryipbw 7aam(0n 9jc hoxj;ql+i:2sr1q l8ng wires are shown end on in the figure below. Therj9o aqjq8 ab +cml1ihl(n ;wp2s x7:0 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 coil of wire. A conventional electricaeng0-o872c m 4vephptf)y)f sl current is then run through the coil from left to right as shown. This will cause the North pole ofptffe c0)2mn8hp-s gv)4y o7e 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 l n* aiuot2vf 110q9okzine passing through point P inside the solenoid shownvo1aknf1tq uz092*i o 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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