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So before we start with the Maxwell's equations, let me tell you about the general philosophy.



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So in the previous section, we have learned that electric and magnetic fields are mainly generated



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by charges and by currents.



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So the idea of the Maxwell equations is to just take all of the charges and all of the currents in the



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whole space, and for this we will make a density out of them.



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We will consider the charge density of our and the current density g of art that can also be time dependent.



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And then we take these charged densities and current densities and they will enter the Maxwell's equations



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and you will see you will just need these two quantities to calculate the electric field and the magnetic



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field based on these equations.