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

1#

96.27: A long straight wire conductor is placed below a compass. Whe bbs8e1q ykmn;:+5yc8jnb2 phou43by n the conventional current in the conductor is from south to north and large, the N pole of the compass:q:+ jo8kmy c43bne5u yhbby b;2n81 ps

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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)iysb/ n c1fej-w -rk* along the dotted lines shown. None of the rwf)-bi/ jc1ks n*e-ypieces are 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 aroundn hzb)9ul v8) 1*o6ux gahcht4 three permanent magnets. Pol)xhu)1l nt 4*9ahvoh8bucz6 g e 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 (poso/8)(rp euro litive) electric current flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic fie(luo 8re)orp/ld 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 ay: ifghit*9n4jy ac3xc4pq;: s shown in the accompanying diagram. Which optio h3;p9j yg xi4ia*:yctn:fcq 4n 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 representationg3sg /)c3r q ho9daspym8ms7 kr w6o09f/ kjp2 of magnetic field lines is inconsistent? The squares in the dig6 wps3acsqk7)d 8o fs9rkhorpymm 0 3/9gj2/agrams 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 dire44rzia). o*l hg tprx,cted into the plane of the page as shown in the figure. Which one of the arrows shown best indiirz)4a.xr t g h*l,4opcates 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 8fx (tx8d(w,u) v aqkgso that the conventional 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 (asx kafv,t(qd8g8( )wxuide 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 figure betrei*t;64 :z)sgxbpdt 6ay -clow. The wigtcx* ptbidz6:yset4 ;6) -r are 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 conventional electrical cu 23b( kiu 4ynqp7rk0zcrrent is then run through the coil from left to right asi (y7 z 3pkbk2qc0u4rn 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 i.9lw8 xaiwt , ;6lha z*v2oznznside the solenoid shown iszaznz.i82avo6wxhl* 9l ;w t,
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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