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a copper wire having resistance r is cut into 4 equal parts a copper wire having resistance r is cut into four equal parts a copper wire having resistance r a copper wire having resistance r is divided into 10 equal parts a copper wire of resistance r is cut into 10 equal parts a copper wire of resistance r is stretched to double its length a copper wire of resistance r is cut into 20 a copper wire of resistance r is uniformly stretched a copper wire is cylindrical and has resistance r a copper wire of resistance r is cut into
