Physics · 2019
JEE Main · 9 January 2019, Shift 1 · Q8
A rod, of length L at room temperature and uniform area of cross section A, is made of a metal having coefficient of linear expansion α /^° C. It is…
A rod, of length L at room temperature and uniform area of cross section A, is made of a metal having coefficient of linear expansion $\displaystyle \alpha /{ }^{\circ} \mathrm{C}$. It is observed that an external compressive force F, is applied on each of its ends, prevents any change in the length of the rod, when its temperature rises by $\displaystyle \Delta \mathrm{T} \mathrm{K}$. Young's modulus, Y , for this metal is :
Official answer
(2)
$\displaystyle \frac{\mathrm{F}}{\mathrm{~A} \alpha \Delta \mathrm{~T}}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.