For 10 points, identify this equation of electrostatics which relates the force to the inverse square of the distance between two charges.
This law can be generalized to a time-dependent version involving differentiated retarded potentials which is included in Jefimenko's Equations. A gauge named for this law sets the divergence of the magnetic vector potential to zero and involves solving Poisson's equation. This law is weakened in the presence of electric field screening, and Oliver Heaviside derived a variant of it accounting for relativity. Though it doesn't account for gravity, it was discovered after experimentation with a (*) torsion balance, and this analogue to the Biot-Savart law contains a namesake constant equal to one over four pi times the permittivity of free space. For 10 points, identify this equation of electrostatics which relates the force to the inverse square of the distance between two charges.
This law can be generalized to a time-dependent version involving differentiated retarded potentials which is included in Jefimenko's Equations.
Coulomb's Law