79. A rod is fixed between two points at

A rod is fixed between two points at 20°C. The coefficient of linear expansion of material of rod is 1.1×10^-5/°C and Young’s modulus is 1.2×10¹¹ N/m² . Find the stress developed in the rod  if temperature of rod becomes 10°C

(a)     1.32×10⁷ N/m²                         (b)  1.10×10¹⁵ N/m²

(c)      1.32×10⁸ N/m²                         (d)  1.10×10⁶ N/m²

Answer-a