Question

Find the Coulomb force between two electric charges of `4 xx 10^(-6)` `C` and `5 xx 10^(-6)` `C`, if the distance between the two charges is `2` `cm`?

Answer 1

First we need to convert the distance to the SI unit, so it is `0.02` `m`.

Then `F=(kq_1q_2)/r^2=(9xx10^9xx4xx10^(-6)xx5xx10^(-6))/0.02=9` `N`