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範例:靜電庫侖力與靜力平衡

右圖中兩細線的長度均為LAB兩小球帶有同性電荷,其中A為可動,B則被固定於鉛垂線處。若A球的質量為m,平衡時AB相距x,重力加速度為g,試求:(1)平衡時AB兩球間的靜電力大小為若干?(2)若只改變A的電量,當其電量變為原先的8倍而再度平衡時,AB間的電力變為原來的多少倍?【南一中】


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