A given wire of resistance 1 ohm is stretched

Asked by admin @ 16/08/2021 in Physics viewed by 297 People

A given wire of resistance 1 ohm is stretched to double its length what will be the new resistance

Answered by admin @ 16/08/2021

R=ρ $\frac{l}{a}$

New length = 2l

New area of cross section = a/2

Therefore new resistance R' = ρ $\frac{2l}{a/2}$

= 4R

∴ R' = 4R

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