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

1#

96.27: A long straight wire conductor is plact)c8ucts f0k2a+ 8s2elp1qq tjh)k y1 ed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of they8 acjk1 + 2)stkpe8s 1 0qf2h)ltcuqt 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 bmvnuy5o2*f70 p2eup ie cut in half along the dotted lines shown. None of the pieces are rotated. Aftim e2 5p*pu2fonv07yuer 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 rie3r1sv: nre)y ght depicts iron filings sprinkled around three permanent3r):vn1 ersye magnets. 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 fn3v, +maud cr: .2cf j6xazg(nlows from left to right in a wire as shown in the diagram, what is the direction of the magnetic fieu cg fcm+r.a23n 6xnajdv:,(zld 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 len(0xlu odr t/7 .5holoi+ou.d ft to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field at olludoiont+5./x 0 our(dh .7point 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 repres(3;;d7f tpga2a i qdr *y0xyxbentation of magnetic field lines is inconsistent? The squares in the diagrams be*y;3tq2f07 x( pdiar yb gaxd;low 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 conventiz,,uj * x6fafconal current directed into the plane of tf6fc xz,,auj* he 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 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 thx 6g71hxwa3xh5p- vdpe left wire (2 A) comes out of the plane of the page and the conventional cu1 vdgx7hxawx 56ph- p3rrent 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 figu.b 5f boi8yp vnnjlv2,i/y1)sre below. The wire on vyi1y8o2.bf5jn si) ,v/pbln
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 ele)n b+;xt ) adxmetz8l497eztsctrical current is then run throutz8))etnxd tbaz + exl9s;4 7mgh the coil from left to right as shown. This will 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 insfcr9kq:g4m.q2bzz 6 aide the solenoid shown is mb4g:2zfk. 9 qcazq6r
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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