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【单选题】
有 N 个电量为 q 的点电荷,以两种方式分布在相同半径的圆周上(如图所示):一种是无规则地分布,另一种是均匀分布。比较这两种情况下在过圆心 O 并且垂直于圆平面的 z 轴上任一点 P 的场强与电势,则有:A.
场强相等，电势相等
B.
场强不等，电势不等
C.
场强分量Ez相等，电势相等
D.
场强分量Ez相等，电势不等
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举一反三
【单选题】— Jerry, do remember to take the medicine three times a day and stay in bed for two days. — ______, Doctor. I will do it as told. [ ]
A.
Got it
B.
That's right
C.
That's OK
D.
I think so
【单选题】— Do remember to take this medicine three times a day with warm boiled water. — _________.
A.
Put it
B.
Made it
C.
Got it
D.
Taken it
【单选题】-Do remember to take this medicine three times a day with warm boiled water. -________. [ ]
A.
Heard it
B.
Made it
C.
Got it
D.
Taken it
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