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

1#

96.27: A long straight wire conductor is placed below a compass. When thvpe ijv 8o0/ m/svb;7gs;3 rrhe conventional current in the conductor is from south to north and larger;ehvo7v 0s r3 i/b8;pg/jvm s, 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 along the dotted zka1z -7y aai-lines shown. None of the paa 7kiaz-y1-zieces are 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 right depicts iron filings sprink v6gfr ue42r*tled around three permanent magnets. Pole R is the sar4 ef6tuv *rg2me 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 le-nk(, a dy+vrwn/fg y3ft to right in a wire as shown in the diagram, what is the direction of the magnetic field at ,k (rn+ga/wdyv3-yfn 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 left to right7aetjhs9-ojnfkxcj 0 p)*t1 lc11 1tn as shown in the accomtx he0tl7cfks1j 1cjt n p19o) n1ja-*panying diagram. Which option 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 represe/gh:aqaqk kigz-5wl:-n-+ r vntation of magnetic field lines is inconsistent?v +g kz-:a-igr5hqqk/wnl:a - 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 directed i s;hd5s9-f; pgd8ndk hnto the plane of the page as shown in the figure. Which one of the arrows shown best indicates the directidfshs8 hn;gk5d;d9 p-on 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 nkpu-4w ggv z5)uxaqi2znx 7ue jky 2uv)(1 05so 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)enzw u2)1xv 5z(ip2uqu)gnk5k4jyu x0gv7-a 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 3awsw7rm-(2 :fu x wy- ngae-ron in the figure below. Th yf7:er(sgu3-a wamwn2 r-wx-e 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 ele7 *kk6j+ofqo ectrical current is then run through the coil from left to right as shown. This will cause the North pole of the compass tokj+7e fokq6* o:

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 P inside the 5,s ir tlh2.on8(u-buptwbjp u.,w d/6bul;z solenoid shown is 6 s,d( ubwt 2j;8u-nw bzt p/..,ohu urlil5pb
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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