Which one is more elastic rubber or steel? Explain.

Explanation

Consider two rods of rubber and steel each of length l and area of cross section A. Let `Y_(r), Y_(s)` be the Young's moludus of elasticity of ruabber and steel respectively, when a stretching force F is applied on each rod, let `Delta l_(r ), Delta l_(s)` be the extension in the rubber rod and steel rod respectively, where `Delta l_( r) gt Delta i_(s)`
Then `Y_( r) = (Fl)/(A Delta l_(r )) and Y_(s) = F/A (l)/(Delta l_(s))`
`(Y_s)/(Y_r) =(Delta l_(r))/(Delta l_(s))` gt 1 `i.e., Y_(s) gt Y_(r )`
Therefore steel is more elastic than rubber.