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

1#

96.27: A long straight wro-w- ,q)q+trt8e-fj h ,irqhire conductor is placed below a compass. When the conventional currj hqqwr )e-+thr-o-8tf r,iq,ent in 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 along the dotted lines shown. Nj*lj* b anc q6*r;gb)vone of the pieces are rotated. After the l*ajvj;bgrc)nb 6 *q* 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 iulhuo(7;3i-1v m py6 ppqf09 p0asbubron filings sprinkled around three permanent magnets. Pole R is the samib9pus6u0;a 7qp u31y-olbf(v h0 pmpe 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 (e l2),fsov 5.gghlqbi4f-b q) positive) electric current flows from left to right in a wire as shown in the diagram, what is the direction g5)f.s )qg4el oib,h2fqv- blof 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 hor 5x*83temdpzz0 j:g0za nc ;z*7j pqqeizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at point *: q 5703zg ;cqzd0pztpnx8j aez*mejP?

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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, whin( ep si)be*)7qs; qagch representation of magnetic field lines is inconsistent? The squares in the diagrams below simply re g q)spis;naq)(e b*7epresent 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(.c 3 /4n (nrhs kg+2n:aozv xtmylww; into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated with this wire at the location lanryxwwv t/k sl.hmgz a o3(4;n:+n (2cbeled 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 ,)my*il9ip/ crw )u5x-z9cjwp3 ej gv fixed in space so 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 Regi gei-),v*l5mz3wpjcwr yuix/9j cp9) on(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 a b khhlb/nc/g qq9(n ,6h:,1euxjtv,vre shown end on in the figure below. The (6,h/,h j/g1qnuh e q,t cvkbnv 9bx:lwire 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 cxo2 7 ng3crqkvkh3n )j0d7j p /1bm7bturrent is then run through the coil from left to right as shown. This will cause the North pole of the ck7 bdjv0 h/ cb17jn3)7kxn2 pq tmro3gompass 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/yuxts0.67ozl aa8v *b nxq6dine passing through point P inside the solenoid shownolt abqv6y.usn7 / 6ax0z*dx8 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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