Question

If x, longitudinal strain is produced in a wire of young's modulus y then energy stored in the material of the wire per unit volume is....... 

(A) yx² 

(B) 2yx² 

(C) (1/2) y²x 

(D) (1/2) yx²

Answer 1

Correct option: (D) (1/2) yx²

Explanation:

Energy stored per unit volume = 1/2 × stress × strain

= 1/2 × 4 × strain × strain ----- Y = [{stress} / {strain}]

= 1/2 yx²