# Finding volume and surface densities of bound charge

## Homework Statement

A slab of material has parallel faces. One coincides with the xy plane (z = 0), while the other is given by z = zt . The material has a nonuniform polarization P = P(1 + αz)zˆ where P and α are constants. Fin the volume and surface densities of bound charges[/B]

## The Attempt at a Solution

I think that
holds for this case. However, I couldn't any further. Please, help asap. Will appreciate so much![/B]