A wire of natural length `l`, young's modulus Y and area of cross-section A is extended by x. Then, the energy stored in the wire is given by

Options

A. `1/2 (YA)/l x^(2)`
B. `1/3 (YA)/l x^(2)`
C. `1/2 (Yl)/A x^(2)`
D. `1/2 (A)/(Yl) x^(2)`

Answer

A