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Physics, 21.08.2021 14:00 yaaaaa31gghgf

Hai điện tích q1 = 4.10-9C; q2 = 9.10-9C lần lượt đặt tại A và B trong không khí, AB = 10cm. Một điện tích q3 đặt
tại C. Hỏi:
a- C ở đâu để q3 cân bằng?
b- Dấu và độ lớn của q3 để q1 và q2 cân bằng?

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