問題詳情
將玻璃棒以絲絹來回摩擦後，移近一絕緣支架上的金屬球，如附圖所示，則金屬球靠近玻璃棒附近的感應電荷電性為 
(A)正電
(B)負電
(C)中性
(D)有時正電，有時負電。
(A)正電
(B)負電
(C)中性
(D)有時正電，有時負電。
參考答案
答案：B
難度：適中0.5
統計：A(1),B(1),C(0),D(0),E(0)
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