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  • If a copper wire is stretched to increase its length by . The percentage increase in resistance of the wire is _________

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is _________ %

Option: 1

44


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \text { Length becomes }=1.2 \text { times } \\ \end{aligned}

\begin{aligned} & \ell^{\prime}=1.2 \ell \\ \end{aligned}

\begin{aligned} & \mathrm{R}^{\prime}=\mathrm{n}^2 \mathrm{R} \\ \end{aligned}

\begin{aligned} & =(1.2)^2 \mathrm{R} \\ \end{aligned}

\begin{aligned} & =1.44 \mathrm{R} \\ \end{aligned}

\begin{aligned} & \Delta \mathrm{R}=0.44 \mathrm{R} \\ \end{aligned}

\begin{aligned} & \frac{\Delta \mathrm{R}}{\mathrm{R}} \times 100 \%=44 \% \end{aligned}

Posted by

Kuldeep Maurya

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