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Cho 2 dòng điện thẳng dài vô hạn song song với nhau đặt cách nhau 5cm, cường độ của 2 dòng điện đó bằng nhau và bằng I=10A. Xác định vectơ cảm ứng từ B gây ra bởi các dòng điện đó tại 1 điểm A nằm ở giữa 2 dòng điện trong các trường hợp sau
a/ các dòng điện chạy cùng chiều
b/ các dòng điện chạy ngược chiều
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Cho 2 dòng điện thẳng dài vô hạn song song với nhau đặt cách nhau 5cm, cường độ của 2 dòng điện đó b...
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