A wire of length L and cross sectional area A is made of a material of Young's modulus Y. If the wire is streched by an amount x, the work done is………………

Explanation

work done=elastic potential energy of stretched wire
`= 1/2 xx Y x (strai n)^(2) xx volume`
` 1/2 xx Y xx ((x)/(L))^(2) xx (A xx L) = (Y A x^(2))/(2L)`