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duyvipboss
1 năm trước
hai dây dẫn thẳng dài đặt song song trong không khí cách nhau một khoảng 6 cm có dòng điện ngược chiều I1 = 1A ; I2=2A. a)xác định cảm ứng từ tại N cách I1một đoạn 6 cm ,cách I2 một đoạn 12cm? b)xác định vị trí tại đó cảm ứng từ bằng 0?
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