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## Main Question or Discussion Point

What practically obtained experimental evidence could be used to distinguish between the location of electromagnetic energy density given by these contending terms,

[tex]E^2+B^2[/tex]

vs.

[tex]\bar{J}\cdot \bar{A}+\rho \phi \ ,[/tex]

where A is the magnetic potential, [itex]\rho[/itex] is charge density and [itex]\phi[/itex] is the electric potential?

[tex]E^2+B^2[/tex]

vs.

[tex]\bar{J}\cdot \bar{A}+\rho \phi \ ,[/tex]

where A is the magnetic potential, [itex]\rho[/itex] is charge density and [itex]\phi[/itex] is the electric potential?

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