2. Conceptual Problem: Many real charge distributions can be approximated by the simple distributions considered in this chapter. Sketch and estimate the dependence of electric field E for these charge distributions, a) Dipole, b) Point Charge, c) Line Charge and Plane Charge. 3. A thin-walled pipe 3.0 m long and 2.0 cm in radius carries a net charge q = 5.7 C distributed uniformly over its surface. Calculate E, at 3.0 cm and 1.0 cm from the pipe's axis, far from either end. = 3m- 2cm Elem 3 cm