A stress of $1.5\,kg.wt/mm^2$ is applied to a wire of Young's modulus $5 \times 10^{11}\,N/m^2$ . The percentage increase in its length is
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Stress $=1.5 \mathrm{kg} . \mathrm{wt} / \mathrm{mm}^{2}$
$Y=5 \times 10$
$\frac{\Delta \ell}{\ell}=\frac{\text { Stress }}{\mathrm{Y}}$
$\frac{\Delta \ell}{\ell}=\frac{1.5 \times 10^{6} \times 10}{5 \times 10^{11}} \times 100$
$\frac{\Delta \ell}{\ell}=3 \times 10^{-3} \%$
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