Question

A uniform metal rod of 2mm² cross section is heated from 0°C to 20°C. The coefficient of linear expansion of the rod is 12x 10^–6/ºC. Its Young’s modulus of elasticity is 10¹¹ Nm^–2. The energy stored per unit volume of the rod is 

 (1) 2880 Jm^–3 

(2) 1500 Jm^–3 

(3) 5760 Jm^–3 

(4) 1440 Jm^–3 

Answer 1

Correct option (1) 2880 Jm^–3

Explanation:

Energy per unit volume