Physics - Elasticity Question with Solution | TestHub

Each of three blocks $P, Q$ and $R$ shown in figure has a mass of $3 \mathrm{kg}$. Each of the wire $A$ and $B$ has cross-sectional area $0.005 {\mathrm{cm}}^2$ and Young's modulus $2\times {10}^{11} \mathrm{N} {\mathrm{m}}^{-2}$. Neglecting friction, the longitudinal strain on wire $B$ is _____ $\times {10}^{-4}$. (Take $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)