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

1#

96.27: A long straight wire conductor is placed below a cooc//z)gib +xt)gzrso e 9*.--kjtiwp mpass. When the conventional currs- ki)rg z9/bzti*pe/.oo-xcjtw )+g 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 lines8thv-4 2xboa 1f.cpml shown. None of the pieces are rotated. A 8t4a-omv 12bpc hxlf.fter 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 t v5ccz3() nuwj8 e0* xed,cwlpermanent magnets. Pole R is the sal c03xu8 d wvt jnce5,*)ecw(zme 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) elfmc9-vg ,y*wl- h17libwr onu r30, otectric current flows from left to right in a wire as shown in the diagram, what is wg3u0nt,c- , yor-fb1vo riw l*9lmh7 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 (zt w 7:c*ylyv:zlqu. horizontal wire from left to right as showztw lv(c:y yqz. *u7l:n in the accompanying diagram. 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 current understanding of physics, which repr 0 pk4r jrwom7crn*le*b8 ;vs4esentation of magnetic field lines is inconsistent? The squarv*n8oml *;rb7 cprwj 4kse0r4 es 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 lv)*-at km,e luyc91 3+uwwjx a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown bes9w 3,*y ce jm)xw vul1-atl+ukt 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 curr0izaxq*uhdmf2k , b3)ent 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 cur qmbu f0a3,2di hz*k)xrents?

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 cuay/v: +ml zky s9o,km)rrent-carrying wires are shown end on in the figure below. Thek/ y mo,vm zs)ykl:+9a 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 convg4p w6hbl5k5lentional electrical current is then run through the coil from left to right as shown. This will cause the Northl h55gp6w kb4l 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 lined, hq7. fnr1.+lsxnjvpm8bj9 passing through point P inside the solenoid shown isnj vqpmx,d.7.+jbhrn9sf 8l 1
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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