A metal rod having linear expansion coefficient 2 $\times {10}^{-5}°C^{-1}$ has a length of 1 m at ${20}^{\circ }$C. The temperature at which it is shortened by 1 mm is

Q. A metal rod having a linear coefficient of expansion $2\times {10}^{-5}{/}^{\circ }$C has a length 1 m at ${25}^{\circ }$C, the temperature at which it is shortened by 1 mm is :

Q. A rod has actual length at ${20}^{\circ }\text{C}$. Find the highest possible temperature at which the length should be measured, so that the error in measurement do not exceed $0.01\%$. The thermal coefficient of linear expansion is $2\times {10}^{-5}{/}^{\circ }\text{C}$

Q. A metal rod has a length of $1m$ at ${30}^{o}C$. $\alpha$ of metal is $2.5\times {10}^{-5}{/}^{o}C$. The temperature at which it will be shortened by $1mm$ is:

Q. A metal rod has length of 1m at 30 C. '$\alpha$' of metal is $2.5\times {10}^5/C$.The temeperature at which it will be shortened by 1 mm is

Q. An iron rod of length $50cm$ is joined at an end to an aluminium rod of length $100cm$. All measurements are made at ${20}^{\circ }C$. Find the length of the composite system at ${100}^{\circ }C$ and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminium are $12\times {10}^{-6}{/}^{\circ }C$ and $24\times {10}^{-6}{/}^{\circ }C$ respectively.