1. The problem statement, all variables and given/known data Sketch the electrical field lines of a uniformly charged insulating disk. Show field lines close and far away. 2. Relevant equations none, conceptual 3. The attempt at a solution For close to the surface of disk near the center the field lines are almost perpendicular to surface, as you move away from center the field line curves away. For the curve part of the disk the field lines point outwards. For far away the disk is like a pint charge so the field lines point away from the disk. No charge is given so how can i tell, and how does knowing in an insulator the electrons do not move freely help? What if it is a conductor?