Answer & explanation
Correct answer: option 2
$F = \frac{kQ^2}{r^2} = \frac{9\times 10^9 \times (10^{-6})^2}{2^2} = 2.25\times 10^{-3}N$
Correct answer: option 2
$F = \frac{kQ^2}{r^2} = \frac{9\times 10^9 \times (10^{-6})^2}{2^2} = 2.25\times 10^{-3}N$