Physics · 2019
JEE Main · 12 April 2019, Shift 2 · Q9
A uniform cylindrical rod of length L and radius r, is made from a material whose Young's modulus of Elasticity equals Y. When this rod is heated by…
A uniform cylindrical rod of length L and radius r, is made from a material whose Young's modulus of Elasticity equals Y. When this rod is heated by temperature T and simultaneously subjected to a net longitudinal compressional force F, its length remains unchanged. The coefficient of volume expansion, of the material of the rod, is (nearly) equal to :
Official answer
(3)
$\displaystyle 3 \mathrm{~F} /\left(\pi \mathrm{r}^2 \mathrm{YT}\right)$
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