Q 11-10-007JEE MainAIEEE 2011Easy
A metal rod of Young's modulus $Y$ and coefficient of linear expansion $\alpha$ is held at its two ends such that its length remains invariant. If its temperature is raised by $t\ °$C, the linear stress developed in it is
Answer: (B) $Y\alpha t$
Concept. A rod held at fixed length is prevented from expanding by $\alpha t$; that strain becomes a compressive stress $Y\alpha t$.
Answer. Option B.
Solution by Sreeraj P, M.Sc Physics
