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thienthankhox9
2 năm trước
Hai dây dẫn thẳng dài đặt song song cách nhau 20 cm trong không khí. Cho lực từ tác dụng lên mỗi mét chiều dài của mỗi dây là 2.10-4 N và tổng cường độ dòng điện chạy trong hai dây dẫn là 30 A, khi đó cường độ dòng điện trong mỗi dây
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