Physics - Thermodynamics Question with Solution | TestHub

A block is hung by means of two identical wires having cross section area $\mathrm{A}\left(1{\mathrm{mm}}^2\right)$ as shown in the diagram. If temperature is lowered by $\Delta \mathrm{T}\left(10^{\circ }\mathrm{C}\right)$, find the mass (in kg ) to be added to hanging mass such that junction remains at initial position. Given that co-efficient of linear expansion $\alpha =2\times 10^{-5}/{}^{\circ }\mathrm{C}$ and Young's modulus $\mathrm{Y}=5\times 10^{11}\mathrm{N}/{\mathrm{m}}^2$ for the wire. If your answer is $\frac{N}{3}$, fill the value of N.