The magnitude of the force between two charges is directly proportional to the product of the charges. This means:

* If you double one charge, the force doubles.

This is described by Coulomb's Law:

F = k * q1 * q2 / r²

Where:

* F is the electrostatic force

* k is Coulomb's constant

* q1 and q2 are the magnitudes of the charges

* r is the distance between the charges

So, if you double one charge (let's say q1), the force becomes:

F' = k * (2 * q1) * q2 / r² = 2 * (k * q1 * q2 / r²) = 2 * F

Therefore, the magnitude of the force is doubled.