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huongthanh2468
2 năm trước
Cho hai điện tích q1=-q2=2*10^-9C đặt cố định tại hai điểm A và B trong chân không cách nhau 8cm. Xác định lực tác dụng lên điện tích q3=3*10^-9C đặt tại M là trung điểm của AB
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