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

1#

96.27: A long straight wire condue+w1kst/8p-yjl h s0uctor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of /t0lsy p18heu- ks+jw 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 hal+n bo(fmx;lwc (/ zwf).t-i vrf along the dotted lines shown. None of the pieces ar + mlwxf)oct.vnfr/;w zb-( (ie 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 around three kos2xxw4+*v2sf n e(c permanen(kf+xo2*ws 4 vnce 2sxt 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 (posilr-ocp3e 7:sgez4l8 ative) electric current flows from left to right in a wire as shown in t87c4o-3gpaslezl:r e he 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 horizontal wire from left to right qo ;e)ljc*(kda o ( ;ylee,um:as shown in the accompanying diagram. Which opolekq )j(ea(c; :;,l euomy d*tion 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 o8*k .nb v2c3dtvo7kc ak0 - oscq;gw(df physics, which representation of magnetic fied-3 vsc koa;k .q0d7nbk8gt2c* owv (cld lines is inconsistent? The squares in the 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 into the planepws* a (+/+os5n1yt *sszv.wbdd3 lyf of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associ+oswylp*a 1.s f wn*zss 53y/t(+dvb dated 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 current81so jfee hmr 9(vm-2k 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 r-9v m1osee82(kj mh finto 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-carryivl ocv wchw* 3g4 9t*mz5)n0bbng wires are shown end on in the figure below. The wire o bz 3lc0vngww94c*tv)hm*b5on
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 conventionaa 2,: yf7ya dp:iw,f9i7x mcmal electrical current is then run through the coil from left t2i:am ,fd:9xw77ami ycy pfa, o 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 hvx fj/ vxe7f3k))yc2through point P inside the solenoid shown is )j /)x3f cefv7v khx2y
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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