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

1#

96.27: A long straight wire conductor is placed below a compass. Wm2s i0d8o 6sw6wptk08az2ool hen the conventional current in the conductor is from south to northosk0zw82miwds 62l o8ao0 tp6 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 alonglw d oyv4dy7zilo8 +o8a5 0uv2 the dotted lines shown. None of the pieces a+ 2zo 8odlyd584uio l7avywv0re rotated. 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 rignf/ig2 k-acbif qo - )5eya52aht depicts iron filings sprinkled around three permanent mag/-y2b f 5- gafckqeaian)o 2i5nets. Pole 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 fsztq,*3 b ydqlk. 6c-fk,;y zlrom left to right in a wire as shown in the dia q;,kc*byt yzd lq6zs.l,3fk -gram, 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 leftyq df.+60nda cfoly* sj+l ,j0 to right as shown in the accompanying diagram. Which option best represents the direction of the m+n0 jd*sf+6 yco0 llafq.,dyjagnetic 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 undp 0;39k ghu;adcaex-z erstanding of physics, which representation of magnetic field lines is inconsistent? The squax -c9d zaue ;3k;hgp0ares 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 ha0u2qkj516pcm3v;j ok p 7twfbs a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of thtq mjp17p vu652co0 bj;3 kfwke 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 ar ausoulmp35( v5 whr;+.x6ef ce fixed in space so that the conventional current in the left wire (2 A) comes out of the plane of the page and the conuau5l.c(we5o3pm h xv+ rf;s6ventional 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-carrying wires are shown end on in the fq ,tj 3y ;jk3br2i1gnmigure below. The wire on ,ji;t3yg k2j qmn3r1b
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 conven6v r9+9j7:noba yzrow4jjy *rtional electrical current is then run through the coil from left to right as shown. This will cjr9 w6 v b *jj9ozor47yn+:ayrause 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 linefy6yb sj-f+4 *kym.ws passing through point P inside the solenoid shown isy6bsw y. -fk4fyj*s+m
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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