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2 năm trước
Cho 2 điện tích điểm q1=2*10^-7C , q2=-3*10^-7C đặt tại 2 điểm AB trong kk cách nhau 10cm tính lực tác dụng lên q3 đặt tại C trong th sau 1 th1: ac=bc=5cm Th2 ac=10 bc=20cm Th3 ac= 30 bc=20cm Th4 ac 6cm bc = 8cm Th5 ac=bc=ab 2 tìm vị trí để lực rác dụng lên q3=0
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