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Tuananhpc12
2 năm trước
Có 3 quả cầu A,B,C bị nhiễm điện. Quả cầu A đẩy quả cầu B,quả cầu B hút quả cầu C.Đưa thanh nhựa sẫm màu nhiễm điện âm tại gần quả cầu A thì thanh nhựa đẩy quả cầu A.Hỏi quả cầu A,B,C nhiễm điện gì ? Tại sao?
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