On the electrostatic potential and electric field of a uniformly charged
  disk
  We calculate the electrostatic potential and electric field of a uniformly
charged disk everywhere in space. This electrostatic problem was solved long
ago, and its gravitational analogue - even earlier. However, it seems that
physics students are not aware of the solution, because it is not presented in
textbooks. The purpose of the present article is to fill this gap in the
pedagogical literature.
