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Hanhuyen
2 năm trước
Hai điện tích điểm q1=4.10^-8C và q2=-4.10^-8C nằm cố định tại hai điểm AB cách nhau 20cm trong chân không. Tính cường độ điện trường tại: J nằm trên đường trung trực của AB một đoạn 10 căn 3 cm.
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