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L=T-V

as you know it is the lagrangian equation

the effective Lagrangian of the electromagnetic field is given by following relation in gaussian units.

L=(1/8pi) (E^2-B^2)

how is must calculate this relation?

(the energy density of electromagnetic fields is given by u=(1/8pi) (E^2+B^2) )

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# The Effective Lagrangian of the Electromagnetic Field

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