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  • <img alt="\text { If a copper wire is stretched to make it } 0.1 \% \text { longer. The percentage change in its resistance is }" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Ctext%20%7B%

\text { If a copper wire is stretched to make it } 0.1 \% \text { 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

For a given wire, R=\rho L / s ,

L \times s= volume =V= constant

 Therefore, \quad R=\frac{\rho L^2}{V} \Rightarrow R \propto L^2 \frac{\Delta R}{R}=2 \frac{\Delta L}{L}=2(0.1 \%)=0.2 \ \% \ increase

Posted by

Pankaj

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