A metal rod of young's modulus Y and coefficient of thermal expansion α is held at its two ends such that its length

A metal rod of young's modulus Y and coefficient of thermal expansion α 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

(a) αt/y

(b) Y/αt

(d) 1/Yαt

A metal rod of young's modulus Y and coefficient of thermal expansion α is held at its two ends such that its length

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