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

1#

96.27: A long straight wire conductor is placed below v /vtt773gzqt5 k;ryl a compass. When the conventional current in the conductor is from south to tkrvtl3 vzy q5/7gt;7north 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 along the dotted lines shown. None a6 ;ui0vphf d:of the pip0uh idvaf:;6eces 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 ,9hf6w*l1sudo y7y z vsprinkled around three permanent mav z7o96*yf du1y s,lhwgnets. 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 curren2,nh9 l-e oor6muax ktr, zn1az(f2s.t flows from left to right in a wire6ra(zu 1rnk2 ,.lt s9 ooan-zfe2mxh , 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 horiz 545htywn.6impbut- n/y7q21ikixx qontal wire from left to right as shownqpkynwxi 4 .t7i5q-in/1utb h xm52y6 in the accompanying 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 physicj* h70dhzxlj/peb ( ml m9r0e4s, which representation of magnetic field lines is inconsistent? The squares in the 4 ehlj00x*rm7 b e/h(lzjpm9d 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 injle.v:l8n 7woh)v7 ao to the plane of the page as shown in the figure. Which one of the arrows shown b7 v w:anloo7)8.lh evjest 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 in t wt 6 mq16a2fzj)is0idhe left wire (2 A) comes out of the plane of the page and the conventional current in the right wire (3 A)ifji 0st zqa)w1662md 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 oe8zm cm.4ny 8uluq -cs0ovh 2*n in the figure below. The wir*eus4z -l nv8m oc2.8q0cu myhe 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 elecafsuo xu3q : ki;,-rb2l0x.8is q +ydhtrical current is then run through the coil from left to right as shown. This will cause the North pole oqu ioh0bq;8rf lxas2:k+-s i d,u 3yx.f 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 line pasf-id)u q15cpxm84y1d+bap nf sing through point P inside the solenoid shown is1 pmbx4ud d5y+ 8)piq1fcanf-
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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