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ndp1
2 năm trước
Hai dòng điện I1 = 2.5 A ,I2 = 5A chạy trong dây dẫn song song và thẳng dài vô hạn cùng chiều , được đặt trong chân không cách nhau 5cm . Xác định cảm ứng từ tại A cách I1 = 10cm và cách I2 = 5cm
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