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bangdi38
2 năm trước
1. Lực tương tác giữa hai điện tích q1=q2=-4.10^-9 đặt cách nhau 1 đoạn r trong chân không có độ lớn 2,25.10-5N . Tính khoảng cách r giữa 2 điện tích?
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