Question

The length of a metal rod at 0°C is 0.5m. When it is heated, its length increases by 2.7 mm. The final temperature of the rod is (coefficient of linear expansion of the metal = 90 × 10 /°C) ……

(a) 20°C 

(b) 30°C 

(c) 40°C 

(d) 60°C

Answer 1

Correct answer is (d) 60°C

l_t = l₀(1 + at)