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vuquang2k
2 năm trước
Cho 2 điện tích điểm q1 = 8.10-8 C và q2 = - 8.10-8 C đặt tại 2 điểm A và B (AB = 20cm) trong chân không. Xác định lực điện tổng hợp tác dụng lên điện tích q3 = - 8.10-8 C đặt tại điểm C nếu: a) CA = 30cm, CB = 10cm. b) C là trung điểm của AB.
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