The z-axis coincides with the symmetry axis of a flat disk of radius a in the x-y plane. The disk carries a uniform charge per unit area σ < 0. The rim of the disk carries an additional uniform charge per unit length λ > 0. Use a side (edge) view and sketch the electric field lines everywhere assuming that the total charge of the disk is positive. Your sketch must have enough detail to reveal any interesting topological features of the field line pattern.