quocduy300600 quocduy300600
  • 25-12-2022
  • Physics
contestada

Hai dây dẫn có cùng tiết diện và đều được làm bằng đồng, dây thứ nhất có chiều dài 5m, dây thứ hai có chiều dài 15m. So sánh điện trở của hai dây.

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