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Explanation:
[tex]{ \rm{force = \frac{q _{1}q _{2} }{4\pi \phi \: {r}^{2} } }} \\ [/tex]
[tex]{ \rm{force = \frac{1 \times 1 \times 9 \times {10}^{9} }{ {1}^{2} } }} \\ \\ { \boxed{ \rm{force = 9 \times {10}^{9} \: newtons }}}[/tex]