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Hai điện tích q1 =8 x 10 - 8C, q2 = -8 x10 - 8C đặt tại A ,B trong không khí, AB = 4 cm . Tìm vectơ cường độ điện trường tại C với a) CA = CB = 2 cm b) CA= 8 cm; BC = 4 cm
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