Hi,
In EM theory to derive the 'wave equation for electric field in a conducting medium' we make ρfree to be zero, but we still use σ to be nonzero.
My question is why we are doing this ?
σ denotes the conductivity of the material and a material can not conduct if it has no free carriers.
So a non zero σ always implies a non zero free carrier. And ρfree is defined to be the charge density which does not take part in polarization, like the free carriers in the metal.
Thank You
In EM theory to derive the 'wave equation for electric field in a conducting medium' we make ρfree to be zero, but we still use σ to be nonzero.
My question is why we are doing this ?
σ denotes the conductivity of the material and a material can not conduct if it has no free carriers.
So a non zero σ always implies a non zero free carrier. And ρfree is defined to be the charge density which does not take part in polarization, like the free carriers in the metal.
Thank You