Consider a positive charge. q uniformly distributed on a disk (with zero thickness) of radius a. 1) Calculate. at any point of the disk's central axis (i.e., on the line perpendicular to the disk's plane and passing through the disk's center) by means of Coulomb's law and the superposition principle. [25 points] 2) Discuss the case of the field at a point z on the disk's central axis, with z a. [5 points] Consider a positive charge. q uniformly distributed on a disk (with zero thickness) of radius a. 1) Calculate. at any point of the disk's central axis (i.e., on the line perpendicular to the disk's plane and passing through the disk's center) by means of Coulomb's law and the superposition principle. [25 points] 2) Discuss the case of the field at a point z on the disk's central axis, with z a. [5 points]