3.Classical field

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The key actor of classical field:
light (electromagnetic wave, not photon) and the velocity of light transmit in vacuum.

The basic intention of classical field theory is to describe the electromagnetic phenomenon of macrocosmos, not the gravitation phenomenon.

1.At first, the electromagnetic phenomenon of macrocosmos can be viewed as classical mechanics movement of charges (particle). (ref)

1.1.history of discovery

1785~1799, Coulomb: the force between charges

1820~1827, Ampere: current-magnetic field

1832~1855, Faraday: magnetic field-current

1861~1864, Maxwell: Maxwell equations


the retarded potentials