I found most literatures on Electrical or Magnetic fluxes maddeningly unclear about the MATERIAL in which the equations are applied. In free air only? or not? I would like to know if the following 2 statements are true the electrical flux generated by a single charge will look the same in all (uniform) materials. the electrical field E generated by a single charge will change from one material to another depends on εr. I m guessing maxwell equations are really for conductors and air?