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hmduc.m10
2 năm trước
BT: q1=4.10-8C, q2= - 3.10-8 C, q3 = 10-8C, AB =5cm, ε=1. Xác định F tổng hợp do q1, q2, tác dụng lên q3 đặt tại các vị trí sau. a. M là trung điểm của AB. b.N là điểm thuộc AB sao cho: AN = 5cm, BN = 10 cm. c. C sao cho AC = 4 cm, BC = 3cm
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