What's the Coulomb's law?

In layman's term: like charges don't attract while opposite charges doelectrostatic forces between point A( which is charged) and point B (which is also charged) are proportional to the charge of point A and point B. there is also something else about this  law that I don't quite remember.

Here is the formula:

F = k x Q1 x Q2/d^2

What the formula means:

F=force between charges

Q1 and Q2= amount of charge

d=distance between these two charges

k= Coulombs constant (proportionally constant)

I think that about covers it and hopefully this helped.

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

b.a device that inputs heat into a cool object