question_answer

An Indian rubber cord L metre long and area of cross-section A\[metr{{e}^{2}}\] is suspended vertically. Density of rubber is D \[kg/metr{{e}^{3}}\] and Young's modulus of rubber is E \[newton/metr{{e}^{2}}\]. If the wire extends by l metre under its own weight, then extension l is

A)             \[{{L}^{2}}Dg/E\]

B)               \[{{L}^{2}}Dg/2E\]

C)             \[{{L}^{2}}Dg/4E\]

D)               L