Show that the potential measured at a point of the model de-scribed in Problem 4.23 is ma-1 times the potential at the corresponding point of the actual system.
Problem 4.23
An electrostatic system is studied by means of a small-scale model whose total charge and linear dimensions are, respectively, in and n times the charge and dimensions of the actual system. Show that the electric field at a point of the model is nin-2 times the field at the corresponding point of the actual system.