试题与答案

如图,一半径为R的圆盘上均匀分布着电荷量为Q的电荷,在垂直于圆盘且过圆心c的轴线

题型:选择题

题目:

如图,一半径为R的圆盘上均匀分布着电荷量为Q的电荷,在垂直于圆盘且过圆心c的轴线上有a、b、d三个点,a和b、b和c、c和d间的距离均为R,在a点处有一电荷量为q(q>0)的固定点电荷.已知b点处的场强为零,则d点处场强的大小为(k为静电力常量)(  )

A.k3q/R2

B.k10q/9R2

C.k(Q+q)/R2

D.k(9Q+q)/(9R2)

答案:

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答案:A考查情态动词。当对方是决策者时,表示向对方请示或者提出建议时用shall,意为我们可以…………吗?我……好吗?Must意为必须, will表示将要,can表示可能或者能够干某事   

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