Hai điện tích điểm q1 = 10^-9 C ; q2 = -10^-9 C được đặt tại 2 điểm A và B, cách nhau một đoạn AB = 2a, trong không khí. Biết cường độ điện trường tại điểm M nằm trên đường trung trực của AB, cách AB 1 đoạn x là = 4320 V/m (áp dụng với a = 3cm ; x = 4cm) hãy xác định x để cường độ điện trường đặt tại M cực đại ?

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