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

1#

96.27: A long straight wire conductor is placed below bi+kj+h m g1pj/;5 iw*nq xk-ha compass. When the conventional current ihgbk+;+jmkw xj-5 /*1pqhiinn the conductor is from south 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 cut in half 0zzr.qnxh 9 ;t(u)hvus4b 1kwalong the dotted lines shown. None of the pieces arsvuh 0x4h z k;n1.9 (qubtwzr)e 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 sprinkled arqay(l2 cg kp2b.u/(6uk , ixfqound three permanent magnets. Pole R is tfqc2yg/u(ub2xpi q ka,( kl.6he 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 from left to right in al4zdld c e/kc 8g:)7fp wire as shown in the diagram, what zl8p/cgk f4ddl e:) 7cis 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 l5of: k/ bre)c-fsb +gfrom left to right as shown in the accompanying diagram. Which option best representskrf:scof/b + ge)b5l- 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 understandiiq 1akj84oro1: 9v hbeng of physics, which representation of magnetic field lines is inconsistent? The squares in a hv qi1b1j48e:r9ookthe 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 i3- 1q 4nwd4b7guffbb snto the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field ang b4q 714sw3 bfudb-fssociated 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 cu w isjx-s0l( pabk/(h6rrent 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) is theaxb hj(6k(p w-0ss li/re 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 txtyc -,zrxq)6he figure below. Thex qtyx,-)c6 rz 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 electrical curqbu ol3hn)39 vxe *-ucrent is then run through the coil from left to right as shown. This w3n9u3h x-uc eoq)lbv* ill 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 line passing through point P inside tb-+tm(q c f9wzhe solenoid shown z mc(wfqb-t 9+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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