A $6.67\times 10^{-11} Nm^{-2}kg^{-2}$
B $6.67\times 10^{-17} Nm^{-2}kg^{-2}$
C $6.67\times 10^{-11} Nm^{2}kg^{-2}$
D $6.67\times 10^{-12} Nm^{2}kg^{-2}$
Correct Answer: Option A
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