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2017
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The resistance of a wire is 'R' ohm. If it i-s melted and stretched to 'n' times its original length , its new resistance will be :
$\begin{array}{1 1} (1) nR \\ (2) \frac{R}{n} \\ (3) n^2R \\ (4) \frac{R}{n^2} \end{array} $
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