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2 năm trước
Hai dây dẫn thẳng, dài song song cách nhau 10 (cm) trong không khí, dòng điện chạy trên dây 1 là I1 = 2 (A), dòng điện chạy trên dây 2 là I2 = 4 (A) . Tìm vị trí mà tại đó cảm ứng từ bằng 0 trong hai tr ường hợp: a) Hai dòng điện cùng chiều b) Hai dòng điện ngược chiều
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