Physics · 2020
JEE Main · 5 September 2020, Shift 2 · Q6
Two different wires having lengths L_1 and L_2, and respective temperature coefficient of linear expansion α_1 and α_2, are joined end-to-end. Then…
Two different wires having lengths $\displaystyle \mathrm{L}_1$ and $\displaystyle \mathrm{L}_2$, and respective temperature coefficient of linear expansion $\displaystyle \alpha_1$ and $\displaystyle \alpha_2$, are joined end-to-end. Then the effective temperature coefficient of linear expansion is :
Official answer
(3)
$\displaystyle \frac{\alpha_1 \mathrm{~L}_1+\alpha_2 \mathrm{~L}_2}{\mathrm{~L}_1+\mathrm{L}_2}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.