Silicon nitrides $(S{i}_3{N}_4)$ are used in the automotive industry, particularly the various wear and combustion parts in reciprocating engines where stresses at high temperatures are prevalent. Calculate the coulomb force of attraction between $S{i}^{4+}$ and $N^{3-}.$ Given $r_{si}^{4+}=0\mathrm{.}21nm,r_N^{3-}=0\mathrm{.}146nm,K=9{10}^{9}V.\frac{m}{C},$ and charge $q=1\mathrm{.}6{10}^{-19}C.$

$1\mathrm{.}82{10}^{-9}N$

$21\mathrm{.}8{10}^{-9}N$

$61\mathrm{.}27{10}^{-9}N$

$16\mathrm{.}68{10}^{-9}N$