For 10 points, who is this English physicist whose namesake vector gives the  energy flux transported by an electromagnetic field, proportional to E cross B?
In dispersive media, this man's namesake theorem involves a term proportional to the imaginary part of permittivity times the square of electric field, accounting for absorptive dissipation. Without dissipation, his theorem states that the partial time derivative of energy density, plus J dot E, equals minus the divergence of his vector. This expresses conservation of energy in electrodynamics. The Abraham-Minkowski debate is the question of how to generalize his vector to fields in materials. For a plane wave, his vector points in the direction of propagation and has a magnitude of epsilon-nought times the electric field squared. For 10 points, who is this English physicist whose namesake vector gives the  energy flux transported by an electromagnetic field, proportional to E cross B?
In dispersive media, this man's namesake theorem involves a term proportional to the imaginary part of permittivity times the square of electric field, accounting for absorptive dissipation.
John Henry Poynting