A rod of length 2 m is at a tem- perature of 20°C. Find the free expansion of the rod, if the temperature is increased to 50°C, then find stress produced when the rod is (i) fully prevented to expand, (ii) permitted to expand by 0.4 mm. Y= 2 × 10¹¹ N/m²; α = 15 × 10-6/°C.
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