6. The space between two parallel conducting plates of surface area S is

filled with an inhomogenous ohmic medium whose conductivity varies linearly

from ₁ at bottom plate (y-0) to d2 at the other plate (y=d). A de voltage of

Vo is applied to these plates (voltage at y-d is Vo). (a) Determine the total

resistance between the plates? (b) The surface charge densities on the plates.