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Greetings!
We know that, F=(1/4πε0)(q^1q^2)/r^2.
F will be minimum when q1andq2 are minimum i. e. q1=q2=1.6×10−19.
Then, Fmin=9×10^9N×(1.6×10^−10)^2. Fmin=2.3×10^−28N.
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