The charge of sphere 2 is twice that of sphere 1. which vector below shows the force of 2 on 1?

The force of sphere 2 on sphere 1 is presented by the equation

F = k (q1) (q2) / d^2

Since the charge of sphere 2 is twice that of sphere 1

F = k (2q) (q) / d^2

F = 2kq^2/d^2

In vector form this is

2q ∠180°