Fagg, Lawrence W.  "Electromagnetism, Time, and Immanence in Whitehead's Metaphysics."  Process Studies 26, nos. 3-4 (Fall-Winter 1997): 308-17.

Abstract

The electromagnetic interaction underlies the operation of virtually all of earthly nature from rocks and plants to humans and their brains.  Furthermore, it is electromagnetic radiation, light, that has symbolized divine presence in the spiritual life of humankind for millennia.  Given these facts, it is suggested that it is the electromagnetic interaction that is the essential physical agent in effecting the concrescence of microscopic "actual occasions" as well as their irreversible temporal nature.  It is also suggested that, in the context of Whitehead's religious philosophy, these electromagnetic phenomena are meaningful physical correlates to the immanence of God.  [Abstract from The Philosopher's Index]