A $10-nC$ charge is distributed uniformly along the $x$ axis from $x=0$ to $x=4m.$ Which of the following answers is correct for the magnitude $($in $\frac{N}{C})$ of the electric field at $x=+10m$ on the $x$ axis?

$5$

$2\mathrm{.}4$

$1\mathrm{.}8$

$0\mathrm{.}9$

none of these