a wire of resistivity p is stretched to double its length, what is its new resistivity . give reason for our answer.
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rho =p
R= pl/A....(1)
R=R', l=2l ,A=A/2
R'=pl/A 2l/A/2
2l*2/A =4pl/A
R'=4R from eq (1)
R= pl/A....(1)
R=R', l=2l ,A=A/2
R'=pl/A 2l/A/2
2l*2/A =4pl/A
R'=4R from eq (1)
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