Question

dérivé Gauss law in magnetism​

Answer 1

∇⋅B(x)=0. This is a derivation of Gauss's law for magnetism on the assumption that the magnetic field is given by Biot-Savart law. the equations of motion are Maxwell's equations dF=0 and d⋆F=⋆J. And in a specific reference frame this yields in particular ∇⋅B=0.