题目:
如图所示,带电平行金属板A,B,板间的电势差为U,A板带正电,B板中央有一小孔.一带正电的微粒,带电量为q,质量为m,自孔的正上方距板高h处自由落下,若微粒恰能落至A,B板的正中央c点,则:( )
A.微粒在下落过程中动能逐渐增加,重力势能逐渐减小
B.微粒下落过程中重力做功为mg(h+
),电场力做功为-d 2
qU1 2
C.微粒落入电场中,电势能逐渐增大,其增加量为
qU1 2
D.若微粒从距B板高2h处自由下落,则恰好能达到A板
答案:
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