Question

What is the force, in terms of Coulomb's constant, between two electrical charges of `1 C` and `-15 C` that are `9 m` apart?

Answer 1

I found: `0.2k`

Explanation:

We have that the force between the two charges will be:
`F=k|q_1q_2|/r^2`
where `k` is our Coulomb Constant.

So we can write:

`F=k15/9^2=0.18k~~0.2k`