Shown below is a section of an infinitely large non uniformly charged slab with thickness h$.$The charge density is rho $($z$)=$bz$^2$ ?draw a gaussian surface to find the electric field below the slab. The charge on the bottom surface is $0.$The charge on the top surface is bh$^2.$Find the enclosed charge of the slab as a function of h$.$

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a b h a b h