The "lead" in pencils is a graphite composition with a Young's modulus of approximately $1\mathrm{.}0$x$10\backslash$deg N$/$m$?.$ Calculate the change in length of the lead in an automatic pencil if you tap it straight into the pencil with a force of $4\mathrm{.}0$ N$.$ The lead is $0\mathrm{.}50$ mm in diameter and $60$ mm long.O $2,6$ mm $0\mathrm{.}8$ mm $1\mathrm{.}2$ mm $2\mathrm{.}4$ mm