Final answer:
The electric force between two charged particles is determined by their charge and the distance between them, according to Coulomb's Law.
Step-by-step explanation:
The magnitude of the electric force between two particles is determined by their charge and the distance between them. This is described by Coulomb's Law, which states the electric force (F) is directly proportional to the product of the charges (q1 and q2) and inversely proportional to the square of the distance (r) between them, given by the formula F = k * (q1 * q2) / r2, where k is Coulomb's constant.
In reference to your specific question about how the electrostatic force changes when the particles are moved apart, if the gravitational force changes by a factor of n when the distance between two massive charged particles is increased, the electrostatic force will also change by a factor of n, given the similar inverse-square distance dependence in both Coulomb's Law for electrostatic forces and Newton's Law of Universal Gravitation for gravitational forces.