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trinhhongnhung642
2 năm trước
một dòng điện trong ống dây phụ thuộc vào thời gian theo công thức i=0,4(5-t),i tính bằng A, t tính bằng s. ống dây có hệ số tự cảm L=0,002H.Tính suất điện động cảm ứng trong ống dây
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