Each of three blocks P,Q and R shown in figure has a mass of 3kg. 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 (Take $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )
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$\begin{aligned} & a=\frac{10}{3} \mathrm{~m} / \mathrm{s}^2 \\ & 30-T_1=3 \times a \\ & T_1=20 \mathrm{~N} \\ & \text { strain }=\frac{\text { stress }}{Y} \\ & =2 \times 10^{-4}\end{aligned}$