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Câu 5: Khi $α = 30^0$

Câu 5: Khi α=300α = 30^0α=300 thì lực từ tác dụng lên một đơn vị chiều dài là

Thông tin câu hỏi

Câu 5: Khi $α = 30^0$ thì lực từ tác dụng lên một đơn vị chiều dài là