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

1#

96.27: A long straight wire c(4/ bm.7da,y.ce3f uflottsxt01pu j1- lf xaonductor is placed below a compass. When the conventional current in the conductor is ecx-4 l0j.saf,u f u 1d(bt/moptt7l1yx3.affrom 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 dotian)o jsrfg6q);rb87ay f 2d+ted lines shown. None of the pieces are rotated. Afteboi)a+ 8n6)jy ;s rf2argqd f7r 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 tohk ;t5f;ewvmn,)0dk lmo9 z; he right depicts iron filings sprinkled around three permanent magnets z k;f,ovk;;n hmmdo5t90l)we. 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 flows from left to right ind+v hmff-r)cjgtr:3 8 a wire as shown in the diagram, what is the dirvt-fcmgrh8) +:dj3 rf ection 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 t5ddbl j u(f+r*hrough a horizontal wire from left to right as shown in the accompanying d l jrfdu(bd*+5iagram. 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 currentwr2y x bi0p9u1(uz-e)ec4 qsb understanding of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply representc)zb q u9y0e(wu4spx b-r1e 2i 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 q1l8 e cy1xyfa9* jh5ldirected 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 jc 9*yalq5fl81yh 1e xthis 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 conventionalfh8xuuig 5xsp1 i-;u2 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) is there a place on the x-axis (aside from infinity) at which the magnetic field is equal to zero from these currents?-f2i1ux u gxh58 p;usi

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 curreq31k bpucxg.u6vys 9kbs. 3 6unt-carrying wires are shown end on in the figure below. The wire on . ubps33.gck uk sv6uqxb 16y9
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 o+t (j0wibbku;4; kqs zf wire. A conventional electrical current is then run through the coil from left to right as shownw0+b4bjtks ( z k;qui;. 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 thi08b ahflu)x4,b x/r, gdw9zhrough point P inside the solenoid shown xf9 zd0 u,bb)wrgahxi,h48 /lis
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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