A wire fixed at the upper end stretches by length l by applying a force F. The work done in stretching is

Options

A. `(F)/(2 1)`
B. F 1
C. 2 F 1
D. `(F1)/(2)`

Answer

D

Explanation

As work done in stretching the wire = Potential energy stored `=(1)/(2)xx"Stress"xx"Strain"xx"Volume"=(1)/(2)xx(F)/(A)xx(l)/(L)xxAL=(1)/(2)Fl`