Question

What is the magnitude of the columbic force between two point charges +3 microcoulumb and +5 microcoulumb separated from each other by a distance of 30cm in free space. What is the nature of the force?

Answer 1

Gives

$q_1=3\mu c$

$q_2=5\mu c$

$r=30cm =0.3m$

$F=\frac{kq_1q_2}{r^2}$

$F=\frac{9\times10^9\times3\times10^{-6}\times5\times10^{-6}}{0.3^2}=1.5N$

Then

$q_1q_2>0$

Force is repulsive nature