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angelawakeup1994
2 năm trước
Cho ba điện tích như hình vẽ. Trong đó q1 = 4μC. Biết q1 cách q3 một khoảng 4cm. Thay đổi vị trí của q2 trên delta sao cho lực điện tổng hợp tác dụng lên điện tích q3 đạt giá trị cực tiểu thì khoảng cách giữa q3 và q2 lúc đó là 2cm. Giá trị của q2 bằng
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