So before we start with the Maxwell's equations, let me tell you about the general philosophy.
So in the previous section, we have learned that electric and magnetic fields are mainly generated
by charges and by currents.
So the idea of the Maxwell equations is to just take all of the charges and all of the currents in the
whole space, and for this we will make a density out of them.
We will consider the charge density of our and the current density g of art that can also be time dependent.
And then we take these charged densities and current densities and they will enter the Maxwell's equations
and you will see you will just need these two quantities to calculate the electric field and the magnetic
field based on these equations.