$($a$)$What magnitude point charge $($in C$)$ creates a $12,000$ N$/$C electric field at a distance of $0\mathrm{.}230$ m$?($Answer in C$)$

$($b$)$ How large $($in N$/$C$)$ is the field at $10\mathrm{.}0$ m$?($Answer in N$/$C$)$