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

1#

96.27: A long straight wire n) +nf-li+x/yjgtk z6conductor is placed below a compass. When the conventional current in the conductor is from south tt- jy )x/izgk6+f+nnl o 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 19u)u0xgupdy in half along the dotted lines shown. None of the pieces are rotate pu9gdu )y0ux1d. 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 threes2xno 2e8np 0k permanent magnets. Pole R is th e0os8nxkp2 2ne 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 tm.xk5 aat -h8bo right in a wire as sbah8-.xm5k t ahown in the 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 frp5h 6aqbd (a2x;6g;q8td3 wtxr jrp,hom left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic fieldq; j 3a8x5p;6tw,(xrh2 a trdqhbd 6gp 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 curren5qhs-vxykp zt st ui*/jf +.iywg( :-p 3)i-wnt understanding of physics, which representation of magnetic field lines is inconsistent? The squares in guy: q-*-f i.whpz-n3v /ysw)t( i +5sjkixtpthe 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 directed8xd 5ev 3 ovpelm.fm y*6j9-ar 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 wa vm56y38o em vjpxer9 lf*d.-ith 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 cj5l. qeapv jn**tv,6 a4rg(jz urrent in the left wire (2 A) comes out of the plane of the pagpv,5j entjr ( az*.g*vqa4jl 6e 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?

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 iuu a-.z r6pysl;a f34mvl0 5zshown end on in the figure below. The wire olsz v ;-50.u ila43mrpayfu6zn
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 co ztai-9n)1alk 6sz6* 1fspcy dm5*.nggbgd5 s nventional electrical current is then run through the coil from left to right as shocks *gl z -gp*imytfda6 s. 1ga nzns55d)16b9wn. 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 insi x9dq0fult5j;w k.gw 3de the solenoid shown iqwjxfu5.3ltk9g0dw ;s
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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