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lethihongnhi01226353150
2 năm trước
Cho 2 điện tích điểm q1,q2 cách nhau khoảng cách r trong chân không thì lực tương tác giữa chúng là 1,8 N. Khi độ lớn điện tích tăng gấp đôi thì lực tương tác giữa chúng là bao nhiêu ?
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