Coulombs Law, 3 charges 3 dimensions.

[Oblivion77]

Homework Statement

Homework Equations

Fe = (kq1q2)/r^2

The Attempt at a Solution

So for part A and B what is the best way to go about doing this? Could I find the distance between the charges and just use coulombs formula?

 

[LowlyPion]

That looks like the right approach.