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phamkhanh190904
2 năm trước
Tại 2 điểm A và B cách nhau 20 cm trong không khí q1=-3.10'°6C q2=8.10•6C Xác định lực điện trường lên điện tích q3=3.10•6 đặt tại C biết AC=12com và BC 16cm
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