Consider a uniformly charged cylinder (radius R, height H, charge density ρ). Imagine it at the center of a mathematical cube (sides of length L). Calculate the flux of the electric field created by the cylinder through the surface of the cube. How would you answer change if H became greater than L? what can you say about the fluz through the top (parallel to the ends of the cylinder) surface, as compared to that through one of the vertical (parallel to the axis of the cylinder) faces; in particular, how do they compare as H and R vary in size?