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【简答题】
带电+q小球位于贴近带电平行板上极板位置时具有的电势能是ε，取下极板电势为零。现将在上极板位置的中性球一分为二成AB两部分，分别带电为+q、-q。将B缓慢移动到贴近下极板位置，（不计AB间的库伦力、重力）则：
A．外力需做功ε； B．外力需做功2ε； C．B部分在下极板时具有的电势能是ε； D．AB两部分增加的电势能为2ε。
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【单选题】带电平行板电荷器中,均匀充满电介质,在其中挖一个球形空腔,则球心 B 与介质中 A 点的电场场强( )
A.
E A =E B
B.
E A B
C.
E A >E B
D.
不一定
【单选题】密立根油滴实验,是利用作用在油滴上的电场力和重力平衡而测量电量的,其电场由两块水平放置的带电平行板产生。实验中,两块极板的电势差为 U 时,半径为 r 、 带有 2 e 电量的油滴保持静止。当电势差增加到 4 U 时,半径为 2 r 的油滴保持静止,则该油滴所带的电量为
A.
2 e
B.
4 e
C.
8 e
D.
e
【单选题】带电平行板电荷器中,均匀充满电介质,在其中挖一个球形空腔,则球心 B 与介质中 A 点的电场场强( )
A.
E A =E B
B.
E A B
C.
E A >E B
D.
不一定
【单选题】Social change is more likely to occur in societies where there is mixture of different kinds of people than in societies where people are similar in many ways．The simple reason for this is that there ...
A.
two different societies
B.
the necessity of social change
C.
certain factors that determine the ease with which social changes occur
D.
certain factors that promote social change
【单选题】Social change is more likely to occur in societies where there is a mixture of different kinds of people than in societies where people are similar in many ways. The simple reason for this is that the...
A.
greater willingness to accept social change
B.
quicker adaptation to changing circumstances
C.
more respect for different beliefs and behavior
D.
readiness to agree to different opinions and ideas
相关题目：
【单选题】带电平行板电荷器中,均匀充满电介质,在其中挖一个球形空腔,则球心 B 与介质中 A 点的电场场强( )
A.
E A =E B
B.
E A B
C.
E A >E B
D.
不一定
【单选题】密立根油滴实验,是利用作用在油滴上的电场力和重力平衡而测量电量的,其电场由两块水平放置的带电平行板产生。实验中,两块极板的电势差为 U 时,半径为 r 、 带有 2 e 电量的油滴保持静止。当电势差增加到 4 U 时,半径为 2 r 的油滴保持静止,则该油滴所带的电量为
A.
2 e
B.
4 e
C.
8 e
D.
e
【单选题】带电平行板电荷器中,均匀充满电介质,在其中挖一个球形空腔,则球心 B 与介质中 A 点的电场场强( )
A.
E A =E B
B.
E A B
C.
E A >E B
D.
不一定
【单选题】Social change is more likely to occur in societies where there is mixture of different kinds of people than in societies where people are similar in many ways．The simple reason for this is that there ...
A.
two different societies
B.
the necessity of social change
C.
certain factors that determine the ease with which social changes occur
D.
certain factors that promote social change
【单选题】Social change is more likely to occur in societies where there is a mixture of different kinds of people than in societies where people are similar in many ways. The simple reason for this is that the...
A.
greater willingness to accept social change
B.
quicker adaptation to changing circumstances
C.
more respect for different beliefs and behavior
D.
readiness to agree to different opinions and ideas
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