It has been established that electromagnetic waves propagate with the speed of light. The reason is that the electrostatic fields as well as magnetic fields propagate with this speed. Both types of objects, waves as well as static field, contain and transport energy. Therefore it is possible to calculate how much energy and how much energy density a source of field emits into the space. Calculations show that this energy is not zero for elementary particles as well as macroscopic spheres. The calculation is presented in this paper. This leads to a principle problem that has not been answered to date: From where does the static charge obtain the energy, which it permanently emits? The paradox has a second string in its bow: If we allow the trace of a specified element of volume containing an electric field on its way through the space, we will notice that its contents of field energy decrease during time. But where does this effluent energy go?
Electromagnetic waves, Hertzian emitter, Biot Savart's law the paradox
