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2 năm trước
Hai dòng điện chạy theo cùng một chiều trong hai dây dẫn vô hạn song song cách 20cm trong chân không lân lượt có cường độ I1=9A, I2=2A a) xác định vecto cảm ứng từ tại điểm A cách dòng điện thứ nhất I1=30cm dòng điện thứ hai I2=10cm b) Xác định những điểm có cảm ứng từ bằng 0
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