Điện trở của một dây đồng có khối lượng 178g là 1,36 ôm. Tính chiều dài và tiết diện của dây dẫn đó. Biết khối lượng riêng của đồng là 8,9g/cm^3, điện trở suất của đồng là 1,7.10^-8 ôm

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