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nhoka7top1
2 năm trước
Hai điện tích điểm q1 = 2. 10-10 C, q2 = -8. 10-10 C, lần lượt đặt tại A và B trong không khí, biết AB = 5 cm. Tính cường độ điện trường gây ra bởi hệ hai điện tích a. Tại C, sao cho AC = 5cm và CB = 10cm. b. Tại D, sao cho ABD tại thành một tam giác đều.
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