The magnitude of the force from a point charge acting on a test charge is given by:

1. Electrostatic force has its own quantitative law. 2. A point charge is a particle carrying a charge. 3. Its force on a test charge at a distance has a magnitude given by an equation. 4. That equation comes from Coulomb's law. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 18 'Electric Charge and Electric Field', sections 18.1-18.8_