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nhuy113z7
2 năm trước
hai dây dẫn thẳng song song dài vô hạn đặt trong không khí cách nhau 8 cm có dòng điện cùng chiều i1 = i2 = i = 2,4 ampe xét điểm M trên đường trung trực của AB cách AB một đoạn 4cm và tìm cảm ứng từ tại điểm M có độ lớn là bao nhiêu
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