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A wire of resistance R is stretched till...

A wire of resistance R is stretched till its length becomes n times its original length. What will be its new resistance?

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`R=rho1/A` If the length is increased n times to nl, the area of cross section decreases from A to `A/n`.
`therefore` New resistance `=rho(nl)/(A/n)=n^2rhol/A=n^2A`
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