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thutrangg1012
2 năm trước
1. Một dây dẫn bằng nikêlin có tiết diện đều dài 5,5m, có điện trở 110Ω, biết điện trở suất của nikêlin là 0,4.10⁻⁶ Ωm. Tiết diện của dây bằng bao nhiêu? A.0,03 mm² B.0,05 mm² C.0,01 mm² D.0,02 mm² 2.Hai cuộn dây dẫn đồng chất, tiết diện đều, có cùng khối lượng m, cuộn thứ nhất có điện trở 2Ω , có đường kính 0,6mm. Cuộn thứ hai có đường kính 0,2mm. Điện trở của cuộn dây thứ hai bằng bao nhiêu A.1,62Ω B.1620Ω C.162Ω D.16,2Ω
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