Question

1. The force of repulsion between two positive points charge 5 microfarads and 8microfarads separating at a distance of 0.02m apart is what?

Answer 1

Given:

$q_1=\rm 5\; \mu C=5*10^{-6}\: C$

$q_2=\rm 8\; \mu C=8*10^{-6}\: C$

$d=0.02\rm\: m$

The Coulomb's law says

$$F=k\frac{q_1q_2}{d^2}$$

$$F=9*10^9*\frac{5*10^{-6}*8*10^{-6}}{(0.02)^2}=900\:\rm N$$