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(d) The total volume remains the same before and after stretching.
Therefore A x l = A’ x l’
Here l’ = 2 l
A’ = A x l / l’ = A x l / 2 l = A/2
Percentage change in resistance
= Rf – Ri / Rl x 100 = ? l’/A’ - l/A / l ? l/A x 100
= [ (l’/A’ x A/ l) – 1 ] x 100 [(2 l/A/2 x A / l)-1 ] x 100
= 300%
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