1. The problem statement, all variables and given/known data Use Gauss’s law to determine a formula for the electric field outside (and far from the ends) of a long, uniformly charged cylinder of radius R and surface charge density σ C/m2. 2. Relevant equations I suppose net electric flux = ErA = Q/e0 3. The attempt at a solution I solved for E, and then plugged in 4pi^2R^3h for A (surface area of cylinder). Just a blind stab in the dark.