* The charges are larger in magnitude. The force is directly proportional to the product of the charges. So, larger charges will result in a stronger force.

* The charges are closer together. The force is inversely proportional to the square of the distance between the charges. This means that as the charges get closer, the force increases rapidly.

In summary, the force between two charges is strongest when the charges are large and close together.

This is described by Coulomb's Law:

F = k * q1 * q2 / r²

Where:

* F is the force between the charges

* k is Coulomb's constant

* q1 and q2 are the magnitudes of the charges

* r is the distance between the charges