Question

two objects have unlike charges how would the electric force between the two objects change as they move apart

Answer 1

The electric force between two objects with charge q1 and q2 is given by
$F=k_e \frac{q_1 q_2}{d^2}$
where ke is the Coulomb's constant while d is the distance between the two charges.

We can see that the force F scales as the inverse of the square of the distance: $\frac{1}{d^2}$. Therefore, when the two objects move apart from each other, the distance increases and therefore the force between them decreases.