b$)$ How can the final length of the sample be calculated in cold drawing? Demonstrate with the information provided; I want to cold draw $1020$ steel bar from $12$mm to $10$mm by cold drawing. Volume is constant $($length x cross$-$sectional area$).$ The first length is $6000$ mm$,$ what can the final length be$?($Cross section $=$ diameter $12$mm is reduced to $10$mm$.$ The length increases accordingly$).$ Calculate$$the final size L last produced.