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ViviN
2 năm trước
Hai dây dẫn thẳq, rất dài, đặt sog sog cask nhau 10cm trong kk, có 2 dòg điện cùng chiều, có CĐ i1= 9A; i2=16A chạy qua. Xđ cảm ứg từ tổg hợp do 2 dòng điẹn này gây ra tại điểm N nằm trong mp chứa 2 dây và cách đều 2 dây
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