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halu2562000
2 năm trước
có 2019 điện tích có độ lớn bằng nhau ,các điện tích đặt cách đều nhau một khoảng = a trên một đường thẳng trong không khí , các điện tích cùng dấu không cạnh nhau . Lực tác dụng lên điện tích ngoài cùng có độ lớn được xác định bởi công thức nào?
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