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rinmay
2 năm trước
Hai dây dẫn thẳng,song song dài vô hạn đặt cách nhau d=14cm trong không khí, dòng điện chạy trong dây I1=I2=I3=1,25A. Xác định vecto cảm ứng từ bằng 0 a. Cùng chiều b. Ngược chiều
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