Pre-Quantum Electrodynamics

(i) An 'inconsistency' ? No. Self-energy is simply excluded in \ref{Gr(2.42)}, but included in \ref{eq:Energy_as_int_E2}. (ii) Is the energy stored in the fields, or in the charges ? Meaningless question at this stage. Radiation theory points to the preferable interpretation that the energy is stored in the field. (iii) Superposition. Double the charge: quadruple the energy.