Question

If a uniform cylindrical copper rod is pulled from its ends to elongate its length by 20%,keeping its volume constant, find the ratio of the resistance of the original rod and that of the elongated rod. Please answer correctly.

Answer 1

$\huge\red{Answer}$

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see this pic ........

jai siya ram☺ __/\__

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Answer 2

ANSWER

So, the ratio of the resistance of the original rod and that of the elongated rod is approximately 1 : 1.446.