The Maxwell second law is also called "Gauss law of magnetism". Statement: It states that the total magnetic flux $$\psi_m$$ emerging through a closed surface is zero. Integral form: $$\psi_m = \int B.ds = 0$$ .......(3) Equ (3) is the integral form of the Maxwell equation. This equation also proves that the magnetic monopole does not exist. Differential form: Apply Gauss divergence theorem to equ (3). That is: $$\int_{s} B.ds = \int_{v} (\nabla.B) dV$$ Since: $$\int B.ds =0$$ Thus: $$\nabla.B = 0$$ .......(4) Equ(4) is the differential form of the Maxwell second equation.
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