Question

One end of a wire $2m$ long and $0.2{cm}^2$ in cross-section is fixed to a ceiling and a load of $4.8kg$ is attached to the free end. Find the extension of the wire. Young's modulus of steel $=2.0\times {10}^{11}N/m^2$. Take $g=10m/s^2$.

Answer 1

$Y=\frac{FL}{Ax}$

$2\times {10}^{11}=\frac{48\times 2}{0.2\times {10}^{-4}x}$

extension=$24\times {10}^{-6}$m