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  • If a copper wire is stretched to make it 0.1% longer. The percentage change in its resistance is  Option: 1  0.2% increase<

If a copper wire is stretched to make it 0.1% longer. The percentage change in its resistance is
 

Option: 1

 0.2% increase


Option: 2

 0.2% decrease


Option: 3

0.1% increase


Option: 4

 0.1% decrease


Answers (1)

best_answer

\mathrm{\text{For a given wire, }R=\frac{\rho L}{ s}, L \times s= volume =V= constant.}
\mathrm{Therefore, \quad R=\frac{\rho L^2}{V} \Rightarrow R \propto L^2}
\mathrm{\frac{\Delta R}{R}=2 \frac{\Delta L}{L}=2(0.1 \%)=0.2 \%~ increase}

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Gautam harsolia

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