Review PROBLEM SOLVING STRATEGY 24.1 Gauss's law Learning Goal: MODEL: Model the charge distribution as a distribution with symmetry. To practice Problem-Solving Strategy 24.1 for Gauss's law problems. An infinite cylindrical rod has a uniform volume charge density p VISUALIZE: Draw a picture of the charge distribution. (where p > 0). The cross section of the rod has radius ro. Find the . Determine the symmetry of the electric field. magnitude of the electric field E at a distance r from the axis of the Choose and draw a Gaussian surface with the same symmetry. rod. Assume that r