1. The problem statement, all variables and given/known data Given long cylinder of radius 0.2m lies along the z-axis and carries a uniform surface charge density if 10m C/m2. Calculate the flux passing through a window at (rho) = 2m, pie/4 <= (phi) <= 3pie/4 , 2<=z<=4. 2. Relevant equations 3. The attempt at a solution not sure where to start..