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thanh thủy tinh tích điện dương khi cọ xát vào lụa, mảnh polieetilen tích điện âm khi cọ xát vào len. Đưa mảnh lụa và mảnh len lại gần nhau thì: a/ ko hút, ko đẩy nhau b/ hút lẫn nhau c/ vừa hút vừa đẩy nhau d/ đẩy nhau
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